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Investment Securities - Schedule of Available-for-Sale Securities and Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,613,659 | $ 1,668,316
Gross Unrealized Gains | 23 | 45
Gross Unrealized Losses | (168,631) | (161,956)
Less: allowance for credit losses | (17) | (17)
Estimated Fair Value | 1,445,034 | 1,506,388
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 1,002,689 | 1,017,693
Allowance for credit losses | (1,957) | (1,956)
Total held-to-maturity securities, net of ACL | 1,000,732 | 1,015,737
Gross Unrecognized Gains | 0 | 5
Gross Unrecognized Losses | (124,530) | (116,116)
Estimated Fair Value | 878,159 | 901,582
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,919 | 49,894
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,686) | (1,993)
Less: allowance for credit losses | 0 | 0
Estimated Fair Value | 48,233 | 47,901
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 698,189 | 729,090
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (58,863) | (57,693)
Less: allowance for credit losses | 0 | 0
Estimated Fair Value | 639,326 | 671,397
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 800,793 | 823,992
Gross Unrealized Gains | 23 | 45
Gross Unrealized Losses | (102,266) | (96,684)
Less: allowance for credit losses | 0 | 0
Estimated Fair Value | 698,550 | 727,353
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 655,388 | 670,043
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (87,348) | (79,980)
Estimated Fair Value | 568,040 | 590,063
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 54,018 | 54,557
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5,080) | (4,993)
Less: allowance for credit losses | 0 | 0
Estimated Fair Value | 48,938 | 49,564
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 89,966 | 90,227
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (13,000) | (12,867)
Estimated Fair Value | 76,966 | 77,360
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,740 | 8,783
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (434) | (293)
Less: allowance for credit losses | 0 | 0
Estimated Fair Value | 8,306 | 8,490
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 125,003 | 125,114
Gross Unrecognized Gains | 0 | 5
Gross Unrecognized Losses | (9,789) | (8,540)
Estimated Fair Value | 115,214 | 116,579
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 2,000 | 2,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (302) | (300)
Less: allowance for credit losses | (17) | (17)
Estimated Fair Value | 1,681 | 1,683
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 132,332 | 132,309
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (14,393) | (14,729)
Estimated Fair Value | $ 117,939 | $ 117,580

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