Loans and the Allowance for Credit Losses - Past Due Loans Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	$ 6,780,887	$ 6,189,490
Recorded Investment Over 90 Days Past Due and Still Accruing	3,701	2,215
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	19,695	23,371
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	12,588	41,235
Greater Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	77,814	47,466
Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	110,097	112,072
Current
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	6,670,790	6,077,418
Real Estate Loans:
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	4,719,277	4,194,413
Recorded Investment Over 90 Days Past Due and Still Accruing	3,371	442
Real Estate Loans: \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	10,111	7,601
Real Estate Loans: \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	11,555	40,327
Real Estate Loans: \| Greater Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	43,607	22,611
Real Estate Loans: \| Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	65,273	70,539
Real Estate Loans: \| Current
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	4,654,004	4,123,874
Real Estate Loans: \| Commercial
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	2,896,707	2,611,279
Recorded Investment Over 90 Days Past Due and Still Accruing	3,208	363
Real Estate Loans: \| Commercial \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	7,005	1,838
Real Estate Loans: \| Commercial \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	4,127	38,693
Real Estate Loans: \| Commercial \| Greater Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	21,275	10,097
Real Estate Loans: \| Commercial \| Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	32,407	50,628
Real Estate Loans: \| Commercial \| Current
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	2,864,300	2,560,651
Real Estate Loans: \| Construction
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	774,170	639,069
Recorded Investment Over 90 Days Past Due and Still Accruing	110	0
Real Estate Loans: \| Construction \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	519	1,988
Real Estate Loans: \| Construction \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	6,633	72
Real Estate Loans: \| Construction \| Greater Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	8,675	4,363
Real Estate Loans: \| Construction \| Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	15,827	6,423
Real Estate Loans: \| Construction \| Current
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	758,343	632,646
Real Estate Loans: \| Residential
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	1,048,400	944,065
Recorded Investment Over 90 Days Past Due and Still Accruing	53	79
Real Estate Loans: \| Residential \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	2,587	3,775
Real Estate Loans: \| Residential \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	795	1,562
Real Estate Loans: \| Residential \| Greater Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	13,657	8,151
Real Estate Loans: \| Residential \| Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	17,039	13,488
Real Estate Loans: \| Residential \| Current
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	1,031,361	930,577
Commercial
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	1,990,998	1,921,833
Recorded Investment Over 90 Days Past Due and Still Accruing	330	1,760
Commercial \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	9,329	15,585
Commercial \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	1,023	552
Commercial \| Greater Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	33,972	24,692
Commercial \| Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	44,324	40,829
Commercial \| Current
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	1,946,674	1,881,004
Consumer and Other
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	70,612	73,244
Recorded Investment Over 90 Days Past Due and Still Accruing	0	13
Consumer and Other \| 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	255	185
Consumer and Other \| 60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	10	356
Consumer and Other \| Greater Than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	235	163
Consumer and Other \| Total Past Due
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	500	704
Consumer and Other \| Current
Financing Receivable, Past Due [Line Items]
Financing receivable, excluding accrued interest, before allowance for credit loss	$ 70,112	$ 72,540