Fair Value Measurements (Schedule of Financial Instruments) (Details) - USD ($)
$ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
Mar. 31, 2025 |
Dec. 31, 2024 |
| Financial assets: |
|
|
|
|
| Cash and cash equivalents |
$ 222,083
|
$ 209,057
|
$ 234,076
|
$ 205,869
|
| Available for sale debt securities, at fair value |
3,240,067
|
3,164,756
|
|
|
| Held-to-maturity, debt securities |
259,875
|
275,218
|
|
|
| Federal Home Loan Bank and other stock |
132,510
|
115,687
|
|
|
| Equity securities |
19,893
|
19,875
|
|
|
| Loans, net of allowance for credit losses |
19,478,221
|
19,334,004
|
|
|
| Derivative assets |
103,995
|
105,260
|
|
|
| Financial liabilities: |
|
|
|
|
| Certificates of deposit |
3,189,622
|
3,287,276
|
|
|
| Total deposits |
19,100,302
|
19,278,683
|
|
|
| Borrowings |
2,482,979
|
2,111,955
|
|
|
| Subordinated debentures |
407,824
|
406,582
|
|
|
| Derivative liabilities |
104,998
|
106,445
|
|
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Cash and cash equivalents |
222,083
|
211,484
|
|
|
| Available for sale debt securities, at fair value |
267,360
|
266,744
|
|
|
| Held-to-maturity, debt securities |
0
|
0
|
|
|
| Federal Home Loan Bank and other stock |
132,510
|
115,687
|
|
|
| Equity securities |
19,893
|
19,875
|
|
|
| Loans, net of allowance for credit losses |
0
|
0
|
|
|
| Derivative assets |
0
|
0
|
|
|
| Financial liabilities: |
|
|
|
|
| Deposits other than certificates of deposits |
15,910,680
|
15,991,407
|
|
|
| Certificates of deposit |
0
|
0
|
|
|
| Total deposits |
15,910,680
|
15,991,407
|
|
|
| Borrowings |
0
|
0
|
|
|
| Subordinated debentures |
0
|
0
|
|
|
| Derivative liabilities |
0
|
0
|
|
|
| Significant Other Observable Inputs (Level 2) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Cash and cash equivalents |
0
|
0
|
|
|
| Available for sale debt securities, at fair value |
2,972,707
|
2,898,012
|
|
|
| Held-to-maturity, debt securities |
259,875
|
275,218
|
|
|
| Federal Home Loan Bank and other stock |
0
|
0
|
|
|
| Equity securities |
0
|
0
|
|
|
| Loans, net of allowance for credit losses |
0
|
0
|
|
|
| Derivative assets |
105,653
|
105,734
|
|
|
| Financial liabilities: |
|
|
|
|
| Deposits other than certificates of deposits |
0
|
0
|
|
|
| Certificates of deposit |
3,188,905
|
3,288,485
|
|
|
| Total deposits |
3,188,905
|
3,288,485
|
|
|
| Borrowings |
2,484,578
|
2,116,467
|
|
|
| Subordinated debentures |
426,483
|
433,450
|
|
|
| Derivative liabilities |
104,613
|
108,102
|
|
|
| Significant Unobservable Inputs (Level 3) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Cash and cash equivalents |
0
|
0
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Held-to-maturity, debt securities |
0
|
0
|
|
|
| Federal Home Loan Bank and other stock |
0
|
0
|
|
|
| Equity securities |
0
|
0
|
|
|
| Loans, net of allowance for credit losses |
19,540,183
|
19,421,891
|
|
|
| Derivative assets |
0
|
0
|
|
|
| Financial liabilities: |
|
|
|
|
| Deposits other than certificates of deposits |
0
|
0
|
|
|
| Certificates of deposit |
0
|
0
|
|
|
| Total deposits |
0
|
0
|
|
|
| Borrowings |
0
|
0
|
|
|
| Subordinated debentures |
0
|
0
|
|
|
| Derivative liabilities |
0
|
0
|
|
|
| U.S. Treasury obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
267,360
|
266,744
|
|
|
| U.S. Treasury obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
267,360
|
266,744
|
|
|
| U.S. Treasury obligations | Significant Other Observable Inputs (Level 2) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| U.S. Treasury obligations | Significant Unobservable Inputs (Level 3) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Government-agency obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
30,644
|
33,539
|
|
|
| Held-to-maturity, debt securities |
989
|
3,378
|
|
|
| Government-agency obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Held-to-maturity, debt securities |
0
|
0
|
|
|
| Government-agency obligations | Significant Other Observable Inputs (Level 2) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
30,644
|
33,539
|
|
|
| Held-to-maturity, debt securities |
989
|
3,378
|
|
|
| Government-agency obligations | Significant Unobservable Inputs (Level 3) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Held-to-maturity, debt securities |
0
|
0
|
|
|
| Mortgage-backed securities |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
2,690,053
|
2,612,347
|
|
|
| Mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Mortgage-backed securities | Significant Other Observable Inputs (Level 2) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
2,690,053
|
2,612,347
|
|
|
| Mortgage-backed securities | Significant Unobservable Inputs (Level 3) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Asset-backed securities |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
40,324
|
41,761
|
|
|
| Asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Asset-backed securities | Significant Other Observable Inputs (Level 2) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
40,324
|
41,761
|
|
|
| Asset-backed securities | Significant Unobservable Inputs (Level 3) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| State and municipal obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
111,692
|
112,999
|
|
|
| Held-to-maturity, debt securities |
257,951
|
269,711
|
|
|
| State and municipal obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Held-to-maturity, debt securities |
0
|
0
|
|
|
| State and municipal obligations | Significant Other Observable Inputs (Level 2) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
111,692
|
112,999
|
|
|
| Held-to-maturity, debt securities |
257,951
|
269,711
|
|
|
| State and municipal obligations | Significant Unobservable Inputs (Level 3) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Held-to-maturity, debt securities |
0
|
0
|
|
|
| Corporate obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
99,994
|
97,366
|
|
|
| Held-to-maturity, debt securities |
935
|
2,129
|
|
|
| Corporate obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Held-to-maturity, debt securities |
0
|
0
|
|
|
| Corporate obligations | Significant Other Observable Inputs (Level 2) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
99,994
|
97,366
|
|
|
| Held-to-maturity, debt securities |
935
|
2,129
|
|
|
| Corporate obligations | Significant Unobservable Inputs (Level 3) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
0
|
0
|
|
|
| Held-to-maturity, debt securities |
0
|
0
|
|
|
| Carrying value |
|
|
|
|
| Financial assets: |
|
|
|
|
| Cash and cash equivalents |
222,083
|
211,484
|
|
|
| Available for sale debt securities, at fair value |
3,240,067
|
3,164,756
|
|
|
| Held-to-maturity, debt securities |
267,653
|
282,127
|
|
|
| Federal Home Loan Bank and other stock |
132,510
|
115,687
|
|
|
| Equity securities |
19,893
|
19,875
|
|
|
| Loans, net of allowance for credit losses |
19,478,221
|
19,334,004
|
|
|
| Derivative assets |
105,653
|
105,734
|
|
|
| Financial liabilities: |
|
|
|
|
| Deposits other than certificates of deposits |
15,910,680
|
15,991,407
|
|
|
| Certificates of deposit |
3,189,622
|
3,287,276
|
|
|
| Total deposits |
19,100,302
|
19,278,683
|
|
|
| Borrowings |
2,482,979
|
2,111,955
|
|
|
| Subordinated debentures |
407,824
|
406,582
|
|
|
| Derivative liabilities |
104,613
|
108,102
|
|
|
| Carrying value | U.S. Treasury obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
267,360
|
266,744
|
|
|
| Carrying value | Government-agency obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
30,644
|
33,539
|
|
|
| Held-to-maturity, debt securities |
1,000
|
3,400
|
|
|
| Carrying value | Mortgage-backed securities |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
2,690,053
|
2,612,347
|
|
|
| Carrying value | Asset-backed securities |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
40,324
|
41,761
|
|
|
| Carrying value | State and municipal obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
111,692
|
112,999
|
|
|
| Held-to-maturity, debt securities |
265,711
|
276,585
|
|
|
| Carrying value | Corporate obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
99,994
|
97,366
|
|
|
| Held-to-maturity, debt securities |
942
|
2,142
|
|
|
| Fair value |
|
|
|
|
| Financial assets: |
|
|
|
|
| Cash and cash equivalents |
222,083
|
211,484
|
|
|
| Available for sale debt securities, at fair value |
3,240,067
|
3,164,756
|
|
|
| Held-to-maturity, debt securities |
259,875
|
275,218
|
|
|
| Federal Home Loan Bank and other stock |
132,510
|
115,687
|
|
|
| Equity securities |
19,893
|
19,875
|
|
|
| Loans, net of allowance for credit losses |
19,540,183
|
19,421,891
|
|
|
| Derivative assets |
105,653
|
105,734
|
|
|
| Financial liabilities: |
|
|
|
|
| Deposits other than certificates of deposits |
15,910,680
|
15,991,407
|
|
|
| Certificates of deposit |
3,188,905
|
3,288,485
|
|
|
| Total deposits |
19,099,585
|
19,279,892
|
|
|
| Borrowings |
2,484,578
|
2,116,467
|
|
|
| Subordinated debentures |
426,483
|
433,450
|
|
|
| Derivative liabilities |
104,613
|
108,102
|
|
|
| Fair value | U.S. Treasury obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
267,360
|
266,744
|
|
|
| Fair value | Government-agency obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
30,644
|
33,539
|
|
|
| Held-to-maturity, debt securities |
989
|
3,378
|
|
|
| Fair value | Mortgage-backed securities |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
2,690,053
|
2,612,347
|
|
|
| Fair value | Asset-backed securities |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
40,324
|
41,761
|
|
|
| Fair value | State and municipal obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
111,692
|
112,999
|
|
|
| Held-to-maturity, debt securities |
257,951
|
269,711
|
|
|
| Fair value | Corporate obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
99,994
|
97,366
|
|
|
| Held-to-maturity, debt securities |
$ 935
|
$ 2,129
|
|
|