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Investment Securities - Held-to-Maturity Amortized Cost and Fair Value (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost $ 925,198,000 $ 972,207,000
Allowance for Credit Losses 0 0
Net Carrying Amount 925,198,000 972,207,000
Held-to-maturity, gross unrealized gains 75,000 70,000
Held-to-maturity, gross unrealized losses (110,443,000) (127,038,000)
Held to maturity, fair value 814,830,000 845,239,000
Accrued interest 3,600,000 3,700,000
MBS pass-through securities issued by FHLMC, FNMA and GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 306,261,000 331,281,000
Allowance for Credit Losses 0 0
Net Carrying Amount 306,261,000 331,281,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (44,396,000) (50,147,000)
Held to maturity, fair value 261,865,000 281,134,000
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 226,416,000 235,971,000
Allowance for Credit Losses 0 0
Net Carrying Amount 226,416,000 235,971,000
Held-to-maturity, gross unrealized gains 28,000 59,000
Held-to-maturity, gross unrealized losses (24,869,000) (29,503,000)
Held to maturity, fair value 201,575,000 206,527,000
CMOs issued by FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 101,502,000 111,904,000
Allowance for Credit Losses 0 0
Net Carrying Amount 101,502,000 111,904,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (4,779,000) (5,419,000)
Held to maturity, fair value 96,723,000 106,485,000
CMOs issued by GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 51,006,000 52,356,000
Allowance for Credit Losses 0 0
Net Carrying Amount 51,006,000 52,356,000
Held-to-maturity, gross unrealized gains 0 11,000
Held-to-maturity, gross unrealized losses (5,235,000) (3,076,000)
Held to maturity, fair value 45,771,000 49,291,000
SBA-backed securities    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 1,853,000 2,372,000
Allowance for Credit Losses 0 0
Net Carrying Amount 1,853,000 2,372,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (90,000) (133,000)
Held to maturity, fair value 1,763,000 2,239,000
Debentures of government sponsored agencies    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 146,126,000 145,823,000
Allowance for Credit Losses 0 0
Net Carrying Amount 146,126,000 145,823,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (21,994,000) (26,467,000)
Held to maturity, fair value 124,132,000 119,356,000
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 62,034,000 62,500,000
Allowance for Credit Losses 0 0
Net Carrying Amount 62,034,000 62,500,000
Held-to-maturity, gross unrealized gains 47,000 0
Held-to-maturity, gross unrealized losses (7,884,000) (10,741,000)
Held to maturity, fair value 54,197,000 51,759,000
Corporate bonds    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 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 (1,196,000) (1,552,000)
Held to maturity, fair value $ 28,804,000 $ 28,448,000