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Investment Securities - Schedule of Available-for-Sale Securities and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,763,371 | $ 1,803,898
Gross Unrealized Gains | 76 | 63
Gross Unrealized Losses | (181,231) | (205,278)
Allowance for credit losses | (31) | (17)
Estimated Fair Value |  | 1,598,666
HTM, Amortized Cost | 1,077,311 | 1,094,140
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 111,525 | 125,433
HTM estimated fair value | 965,786 | 968,707
HTM Allowance for credit losses | (2,008) | (766)
Investment securities held-to-maturity, net of allowance for credit losses of $2,008 and $766, respectively, (fair value of $965,786 and $968,707, respectively) | 1,075,303 | 1,093,374
Schedule of Held-to-maturity Securities [Line Items] |  |
HTM, Amortized Cost | 1,077,311 | 1,094,140
Gross Unrealized Gains | 0 | 0
Gross unrealized losses | (111,525) | (125,433)
HTM estimated fair value | 965,786 | 968,707
Investment securities available for sale, amortized cost | 1,763,371 | 1,803,898
Gross Unrealized Gains | 76 | 63
Gross Unrealized Losses | 181,231 | 205,278
Allowance for credit losses | 31 | 17
Investment securities available-for-sale: |  | 1,598,666
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,818 | 49,793
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,887) | (3,466)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 46,931 | 46,327
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities available for sale, amortized cost | 49,818 | 49,793
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 2,887 | 3,466
Allowance for credit losses | 0 | 0
Investment securities available-for-sale: | 46,931 | 46,327
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 741,694 | 747,777
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (67,227) | (78,049)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 674,467 | 669,728
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities available for sale, amortized cost | 741,694 | 747,777
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 67,227 | 78,049
Allowance for credit losses | 0 | 0
Investment securities available-for-sale: | 674,467 | 669,728
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 905,524 | 937,557
Gross Unrealized Gains | 76 | 18
Gross Unrealized Losses | (105,358) | (117,072)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 800,242 | 820,503
HTM, Amortized Cost | 724,756 | 741,057
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 77,286 | 88,390
HTM estimated fair value | 647,470 | 652,667
Schedule of Held-to-maturity Securities [Line Items] |  |
HTM, Amortized Cost | 724,756 | 741,057
Gross Unrealized Gains | 0 | 0
Gross unrealized losses | (77,286) | (88,390)
HTM estimated fair value | 647,470 | 652,667
Investment securities available for sale, amortized cost | 905,524 | 937,557
Gross Unrealized Gains | 76 | 18
Gross Unrealized Losses | 105,358 | 117,072
Allowance for credit losses | 0 | 0
Investment securities available-for-sale: | 800,242 | 820,503
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 55,421 | 56,071
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5,139) | (5,858)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 50,282 | 50,213
HTM, Amortized Cost | 92,141 | 92,557
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 11,234 | 11,993
HTM estimated fair value | 80,907 | 80,564
Schedule of Held-to-maturity Securities [Line Items] |  |
HTM, Amortized Cost | 92,141 | 92,557
Gross Unrealized Gains | 0 | 0
Gross unrealized losses | (11,234) | (11,993)
HTM estimated fair value | 80,907 | 80,564
Investment securities available for sale, amortized cost | 55,421 | 56,071
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 5,139 | 5,858
Allowance for credit losses | 0 | 0
Investment securities available-for-sale: | 50,282 | 50,213
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,914 | 10,700
Gross Unrealized Gains | 0 | 45
Gross Unrealized Losses | (432) | (658)
Allowance for credit losses | 0 | 0
Estimated Fair Value | 8,482 | 10,087
HTM, Amortized Cost | 128,160 | 128,273
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 8,690 | 12,092
HTM estimated fair value | 119,470 | 116,181
HTM Allowance for credit losses | 16 |
Schedule of Held-to-maturity Securities [Line Items] |  |
HTM, Amortized Cost | 128,160 | 128,273
Gross Unrealized Gains | 0 | 0
Gross unrealized losses | (8,690) | (12,092)
HTM estimated fair value | 119,470 | 116,181
Investment securities available for sale, amortized cost | 8,914 | 10,700
Gross Unrealized Gains | 0 | 45
Gross Unrealized Losses | 432 | 658
Allowance for credit losses | 0 | 0
Investment securities available-for-sale: | 8,482 | 10,087
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,000 | 2,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (188) | (175)
Allowance for credit losses | (31) | (17)
Estimated Fair Value | 1,781 | 1,808
HTM, Amortized Cost | 132,254 | 132,253
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 14,315 | 12,958
HTM estimated fair value | 117,939 | 119,295
HTM Allowance for credit losses | 2,000 |
Schedule of Held-to-maturity Securities [Line Items] |  |
HTM, Amortized Cost | 132,254 | 132,253
Gross Unrealized Gains | 0 | 0
Gross unrealized losses | (14,315) | (12,958)
HTM estimated fair value | 117,939 | 119,295
Investment securities available for sale, amortized cost | 2,000 | 2,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 188 | 175
Allowance for credit losses | 31 | 17
Investment securities available-for-sale: | 1,781 | $ 1,808
Other Security Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,763,371 |
Estimated Fair Value | 1,582,185 |
Schedule of Held-to-maturity Securities [Line Items] |  |
Investment securities available for sale, amortized cost | 1,763,371 |
Investment securities available-for-sale: | $ 1,582,185 |

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