Fair Value Measurements (Schedule of Financial Instruments) (Detail) - USD ($)
$ in Thousands |
Mar. 31, 2025 |
Dec. 31, 2024 |
Mar. 31, 2024 |
Dec. 31, 2023 |
| Financial assets: |
|
|
|
|
| Cash and cash equivalents |
$ 234,076
|
$ 205,869
|
$ 158,282
|
$ 180,185
|
| Available for sale debt securities, at fair value |
2,878,785
|
2,768,915
|
|
|
| Held-to-maturity, debt securities |
301,190
|
313,733
|
|
|
| Federal Home Loan Bank and other bank stock |
126,923
|
112,767
|
|
|
| Equity securities |
19,219
|
19,110
|
|
|
| Loans, net of allowance for credit losses |
18,749,562
|
18,628,391
|
|
|
| Derivative assets |
144,754
|
179,332
|
|
|
| Financial liabilities: |
|
|
|
|
| Certificates of deposit |
3,165,754
|
3,168,155
|
|
|
| Total deposits |
18,448,863
|
18,623,813
|
|
|
| Borrowings |
2,336,191
|
2,020,435
|
|
|
| Subordinated debentures |
402,853
|
401,608
|
|
|
| Derivative liabilities |
142,514
|
174,548
|
|
|
| Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Cash and cash equivalents |
234,076
|
205,939
|
|
|
| Available for sale debt securities, at fair value |
316,312
|
330,598
|
|
|
| Held-to-maturity, debt securities |
0
|
0
|
|
|
| Federal Home Loan Bank and other bank stock |
126,923
|
112,767
|
|
|
| Equity securities |
19,219
|
19,110
|
|
|
| Loans, net of allowance for credit losses |
0
|
0
|
|
|
| Derivative assets |
0
|
0
|
|
|
| Financial liabilities: |
|
|
|
|
| Deposits other than certificates of deposits |
15,283,109
|
15,455,658
|
|
|
| Certificates of deposit |
0
|
0
|
|
|
| Total deposits |
15,283,109
|
15,455,658
|
|
|
| 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 |
2,562,473
|
2,438,317
|
|
|
| Held-to-maturity, debt securities |
301,190
|
313,733
|
|
|
| Federal Home Loan Bank and other bank stock |
0
|
0
|
|
|
| Equity securities |
0
|
0
|
|
|
| Loans, net of allowance for credit losses |
0
|
0
|
|
|
| Derivative assets |
143,377
|
188,940
|
|
|
| Financial liabilities: |
|
|
|
|
| Deposits other than certificates of deposits |
0
|
0
|
|
|
| Certificates of deposit |
3,163,545
|
3,168,216
|
|
|
| Total deposits |
3,163,545
|
3,168,216
|
|
|
| Borrowings |
2,339,287
|
2,017,013
|
|
|
| Subordinated debentures |
423,451
|
423,675
|
|
|
| Derivative liabilities |
141,383
|
172,601
|
|
|
| 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 bank stock |
0
|
0
|
|
|
| Equity securities |
0
|
0
|
|
|
| Loans, net of allowance for credit losses |
18,709,144
|
18,442,167
|
|
|
| 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 |
316,312
|
330,598
|
|
|
| U.S. Treasury obligations | Quoted Prices in Active Markets for Identical Assets (Level 1) |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
316,312
|
330,598
|
|
|
| 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 |
49,329
|
107,235
|
|
|
| Held-to-maturity, debt securities |
9,801
|
9,707
|
|
|
| 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 |
49,329
|
107,235
|
|
|
| Held-to-maturity, debt securities |
9,801
|
9,707
|
|
|
| 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 |
2,255,838
|
2,062,159
|
|
|
| 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 |
2,255,838
|
2,062,159
|
|
|
| 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 |
46,386
|
47,563
|
|
|
| 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 |
46,386
|
47,563
|
|
|
| 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 |
115,397
|
116,917
|
|
|
| Held-to-maturity, debt securities |
285,440
|
297,674
|
|
|
| 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 |
115,397
|
116,917
|
|
|
| Held-to-maturity, debt securities |
285,440
|
297,674
|
|
|
| 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 |
95,523
|
104,443
|
|
|
| Held-to-maturity, debt securities |
5,949
|
6,352
|
|
|
| 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 |
95,523
|
104,443
|
|
|
| Held-to-maturity, debt securities |
5,949
|
6,352
|
|
|
| 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 |
234,076
|
205,939
|
|
|
| Available for sale debt securities, at fair value |
2,878,785
|
2,768,915
|
|
|
| Held-to-maturity, debt securities |
314,005
|
327,623
|
|
|
| Federal Home Loan Bank and other bank stock |
126,923
|
112,767
|
|
|
| Equity securities |
19,219
|
19,110
|
|
|
| Loans, net of allowance for credit losses |
18,749,562
|
18,628,391
|
|
|
| Derivative assets |
143,377
|
188,940
|
|
|
| Financial liabilities: |
|
|
|
|
| Deposits other than certificates of deposits |
15,283,109
|
15,455,658
|
|
|
| Certificates of deposit |
3,165,754
|
3,168,155
|
|
|
| Total deposits |
18,448,863
|
18,623,813
|
|
|
| Borrowings |
2,336,191
|
2,020,435
|
|
|
| Subordinated debentures |
402,853
|
401,608
|
|
|
| Derivative liabilities |
141,383
|
172,601
|
|
|
| Carrying value | U.S. Treasury obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
316,312
|
330,598
|
|
|
| Carrying value | Government-agency obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
49,329
|
107,235
|
|
|
| Held-to-maturity, debt securities |
9,999
|
9,999
|
|
|
| Carrying value | Mortgage-backed securities |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
2,255,838
|
2,062,159
|
|
|
| Carrying value | Asset-backed securities |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
46,386
|
47,563
|
|
|
| Carrying value | State and municipal obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
115,397
|
116,917
|
|
|
| Held-to-maturity, debt securities |
297,950
|
311,106
|
|
|
| Carrying value | Corporate obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
95,523
|
104,443
|
|
|
| Held-to-maturity, debt securities |
6,056
|
6,518
|
|
|
| Fair value |
|
|
|
|
| Financial assets: |
|
|
|
|
| Cash and cash equivalents |
234,076
|
205,939
|
|
|
| Available for sale debt securities, at fair value |
2,878,785
|
2,768,915
|
|
|
| Held-to-maturity, debt securities |
301,190
|
313,733
|
|
|
| Federal Home Loan Bank and other bank stock |
126,923
|
112,767
|
|
|
| Equity securities |
19,219
|
19,110
|
|
|
| Loans, net of allowance for credit losses |
18,709,144
|
18,442,167
|
|
|
| Derivative assets |
143,377
|
188,940
|
|
|
| Financial liabilities: |
|
|
|
|
| Deposits other than certificates of deposits |
15,283,109
|
15,455,658
|
|
|
| Certificates of deposit |
3,163,545
|
3,168,216
|
|
|
| Total deposits |
18,446,654
|
18,623,874
|
|
|
| Borrowings |
2,339,287
|
2,017,013
|
|
|
| Subordinated debentures |
423,451
|
423,675
|
|
|
| Derivative liabilities |
141,383
|
172,601
|
|
|
| Fair value | U.S. Treasury obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
316,312
|
330,598
|
|
|
| Fair value | Government-agency obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
49,329
|
107,235
|
|
|
| Held-to-maturity, debt securities |
9,801
|
9,707
|
|
|
| Fair value | Mortgage-backed securities |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
2,255,838
|
2,062,159
|
|
|
| Fair value | Asset-backed securities |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
46,386
|
47,563
|
|
|
| Fair value | State and municipal obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
115,397
|
116,917
|
|
|
| Held-to-maturity, debt securities |
285,440
|
297,674
|
|
|
| Fair value | Corporate obligations |
|
|
|
|
| Financial assets: |
|
|
|
|
| Available for sale debt securities, at fair value |
95,523
|
104,443
|
|
|
| Held-to-maturity, debt securities |
$ 5,949
|
$ 6,352
|
|
|