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Investment Securities - Schedule of AFS and HTM securities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 1,550,038 | $ 1,668,316
Gross Unrealized Gains | 125 | 45
Gross Unrealized Losses | (117,140) | (161,956)
Allowance for Credit Losses | (17) | (17)
Estimated Fair Value | 1,433,006 | 1,506,388
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 963,162 | 1,017,693
Allowance for credit losses | (1,237) | (1,956)
Total held-to-maturity securities, net of ACL | 961,925 | 1,015,737
Gross Unrecognized Gains | 0 | 5
Gross Unrecognized Losses | (94,737) | (116,116)
Estimated Fair Value | 868,425 | 901,582
U.S. treasury bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,970 | 49,894
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (567) | (1,993)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 49,403 | 47,901
U. S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 690,699 | 729,090
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (37,422) | (57,693)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 653,277 | 671,397
Residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 745,006 | 823,992
Gross Unrealized Gains | 125 | 45
Gross Unrealized Losses | (75,086) | (96,684)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 670,045 | 727,353
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 621,203 | 670,043
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (66,264) | (79,980)
Estimated Fair Value | 554,939 | 590,063
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 53,711 | 54,557
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,495) | (4,993)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 50,216 | 49,564
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 89,269 | 90,227
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (10,008) | (12,867)
Estimated Fair Value | 79,261 | 77,360
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 8,652 | 8,783
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (385) | (293)
Allowance for Credit Losses | 0 | 0
Estimated Fair Value | 8,267 | 8,490
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 120,307 | 125,114
Gross Unrecognized Gains | 0 | 5
Gross Unrecognized Losses | (8,024) | (8,540)
Estimated Fair Value | 112,283 | 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 | (185) | (300)
Allowance for Credit Losses | (17) | (17)
Estimated Fair Value | 1,798 | 1,683
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 132,383 | 132,309
Gross Unrecognized Gains | 0 | 0
Gross Unrecognized Losses | (10,441) | (14,729)
Estimated Fair Value | $ 121,942 | $ 117,580

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