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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