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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