v3.25.3
Loans and Allowance for Credit Losses on Loans - Loans by Investment Grade (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year $ 2,213,929   $ 2,305,541
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 2,015,021   2,161,134
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 1,842,902   3,438,876
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 2,855,194   1,314,739
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 1,016,598   334,555
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 992,239   1,055,959
Revolving lines of credit 13,318,981   11,901,022
Revolving lines of credit converted to term loans 38,811   30,997
Total 24,293,675   22,542,823
Financing receivable, excluding accrued interest, year one, originated, current fiscal year, writeoff 7,061   994
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year, writeoff 704   7,543
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year, writeoff 2,371   550
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year, writeoff 5,692   4,037
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year, writeoff 28   537
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year, writeoff 858   8,784
Revolving lines of credit, writeoff 21,228   23,566
Revolving line of credit converted to term loans, writeoff 0   44
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff 37,942 $ 29,389 46,055
Commercial      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 1,531,900   1,636,271
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 1,338,995   1,238,889
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 858,555   1,450,224
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 1,002,434   337,071
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 244,509   77,512
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 182,225   203,360
Revolving lines of credit 6,809,836   6,190,224
Revolving lines of credit converted to term loans 30,571   12,040
Total 11,999,025   11,145,591
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff 37,011 23,661  
Commercial | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 1,515,522   1,612,695
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 1,304,446   1,156,414
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 786,716   1,256,539
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 905,138   307,590
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 205,979   76,821
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 158,114   169,974
Revolving lines of credit 6,708,635   6,027,177
Revolving lines of credit converted to term loans 30,271   12,040
Total 11,614,821   10,619,250
Commercial | Special mention      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 972   22,953
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 25,126   28,354
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 7,624   134,092
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 55,824   21,626
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 2,620   30
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 10,778   6,369
Revolving lines of credit 25,298   91,423
Revolving lines of credit converted to term loans 300   0
Total 128,542   304,847
Commercial | Substandard - accruing      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 793   623
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 9,423   44,901
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 60,075   51,536
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 14,400   7,855
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 35,910   301
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 758   3,309
Revolving lines of credit 62,337   37,405
Revolving lines of credit converted to term loans 0   0
Total 183,696   145,930
Commercial | Non-accrual      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 14,613   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   9,220
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 4,140   8,057
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 27,072   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   360
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 12,575   23,708
Revolving lines of credit 13,566   34,219
Revolving lines of credit converted to term loans 0   0
Total 71,966   75,564
Mortgage finance      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 6,057,804   5,215,574
Revolving lines of credit converted to term loans 0   0
Total 6,057,804   5,215,574
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff 0 0  
Mortgage finance | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 6,057,804   5,215,574
Revolving lines of credit converted to term loans 0   0
Total 6,057,804   5,215,574
Mortgage finance | Special mention      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 0   0
Mortgage finance | Substandard - accruing      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 0   0
Mortgage finance | Non-accrual      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 0   0
Commercial real estate      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 653,179   624,918
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 634,056   893,956
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 954,368   1,934,504
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 1,799,693   901,744
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 698,066   216,376
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 693,912   752,164
Revolving lines of credit 255,206   273,663
Revolving lines of credit converted to term loans 8,240   18,957
Total 5,696,720   5,616,282
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff 931 5,698  
Commercial real estate | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 653,167   599,301
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 608,176   889,603
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 951,334   1,843,706
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 1,690,702   885,913
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 694,803   216,077
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 692,056   704,288
Revolving lines of credit 255,206   273,663
Revolving lines of credit converted to term loans 7,448   18,085
Total 5,552,892   5,430,636
Commercial real estate | Special mention      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   25,532
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 25,532   4,353
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   70,161
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 87,907   15,831
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 3,263   299
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 1,856   13,731
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 792   872
Total 119,350   130,779
Commercial real estate | Substandard - accruing      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 12   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 348   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   20,230
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 360   20,230
Commercial real estate | Non-accrual      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   85
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 3,034   20,637
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 21,084   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   13,915
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total 24,118   34,637
Consumer      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 28,850   44,352
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 41,970   28,289
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 29,979   54,148
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 53,067   75,924
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 74,023   40,667
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 116,102   100,435
Revolving lines of credit 196,135   221,561
Revolving lines of credit converted to term loans 0   0
Total 540,126   565,376
Financing receivable, excluding accrued interest, allowance for credit loss, writeoff 0 $ 30  
Consumer | Pass      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 28,850   44,352
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 41,970   28,289
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 29,979   54,148
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 53,067   75,924
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 74,023   40,667
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 116,102   99,471
Revolving lines of credit 194,435   220,561
Revolving lines of credit converted to term loans 0   0
Total 538,426   563,412
Consumer | Special mention      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 1,700   0
Revolving lines of credit converted to term loans 0   0
Total 1,700   0
Consumer | Substandard - accruing      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   0
Revolving lines of credit 0   1,000
Revolving lines of credit converted to term loans 0   0
Total 0   1,000
Consumer | Non-accrual      
Financing Receivable, Recorded Investment [Line Items]      
Financing receivable, excluding accrued interest, year one, originated, current fiscal year 0   0
Financing receivable, excluding accrued interest, year two, originated, fiscal year before current fiscal year 0   0
Financing receivable, excluding accrued interest, year three, originated, two years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year four, originated, three years before current fiscal year 0   0
Financing receivable, excluding accrued interest, year five, originated, four years before current fiscal year 0   0
Financing receivable, excluding accrued interest, originated, more than five years before current fiscal year 0   964
Revolving lines of credit 0   0
Revolving lines of credit converted to term loans 0   0
Total $ 0   $ 964