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Investment Securities - Schedule of Held-to-Maturity Amortized Cost and Fair Value (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity $ 915,068,000 $ 925,198,000
Allowance for Credit Losses 0 0
Net Carrying Amount 915,068,000 925,198,000
Held-to-maturity, gross unrealized gains 4,000 75,000
Held-to-maturity, gross unrealized losses (119,163,000) (110,443,000)
Total 795,909,000 814,830,000
Accrued interest 2,500,000 3,600,000
MBS pass-through securities issued by FHLMC, FNMA and GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 300,976,000 306,261,000
Allowance for Credit Losses 0 0
Net Carrying Amount 300,976,000 306,261,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (48,474,000) (44,396,000)
Total 252,502,000 261,865,000
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 224,676,000 226,416,000
Allowance for Credit Losses 0 0
Net Carrying Amount 224,676,000 226,416,000
Held-to-maturity, gross unrealized gains 0 28,000
Held-to-maturity, gross unrealized losses (26,902,000) (24,869,000)
Total 197,774,000 201,575,000
CMOs issued by FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 98,951,000 101,502,000
Allowance for Credit Losses 0 0
Net Carrying Amount 98,951,000 101,502,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (6,009,000) (4,779,000)
Total 92,942,000 96,723,000
CMOs issued by GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 50,695,000 51,006,000
Allowance for Credit Losses 0 0
Net Carrying Amount 50,695,000 51,006,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (5,436,000) (5,235,000)
Total 45,259,000 45,771,000
SBA-backed securities    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 1,652,000 1,853,000
Allowance for Credit Losses 0 0
Net Carrying Amount 1,652,000 1,853,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (95,000) (90,000)
Total 1,557,000 1,763,000
Debentures of government- sponsored agencies    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 146,202,000 146,126,000
Allowance for Credit Losses 0 0
Net Carrying Amount 146,202,000 146,126,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (22,942,000) (21,994,000)
Total 123,260,000 124,132,000
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 61,916,000 62,034,000
Allowance for Credit Losses 0 0
Net Carrying Amount 61,916,000 62,034,000
Held-to-maturity, gross unrealized gains 4,000 47,000
Held-to-maturity, gross unrealized losses (8,022,000) (7,884,000)
Total 53,898,000 54,197,000
Corporate bonds    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 30,000,000 30,000,000
Allowance for Credit Losses 0 0
Net Carrying Amount 30,000,000 30,000,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (1,283,000) (1,196,000)
Total $ 28,717,000 $ 28,804,000