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Investment Securities - Schedule of Held-to-Maturity Amortized Cost and Fair Value (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity $ 935,142,000 $ 972,207,000
Allowance for Credit Losses 0 0
Net Carrying Amount 935,142,000 972,207,000
Held-to-maturity, gross unrealized gains 226,000 70,000
Held-to-maturity, gross unrealized losses (152,152,000) (127,038,000)
Total 783,216,000 845,239,000
Accrued interest 2,600,000 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]    
Debt securities, held-to-maturity 311,595,000 331,281,000
Allowance for Credit Losses 0 0
Net Carrying Amount 311,595,000 331,281,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (61,870,000) (50,147,000)
Total 249,725,000 281,134,000
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 228,194,000 235,971,000
Allowance for Credit Losses 0 0
Net Carrying Amount 228,194,000 235,971,000
Held-to-maturity, gross unrealized gains 71,000 59,000
Held-to-maturity, gross unrealized losses (33,448,000) (29,503,000)
Total 194,817,000 206,527,000
CMOs issued by FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 104,031,000 111,904,000
Allowance for Credit Losses 0 0
Net Carrying Amount 104,031,000 111,904,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (9,125,000) (5,419,000)
Total 94,906,000 106,485,000
CMOs issued by GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 51,268,000 52,356,000
Allowance for Credit Losses 0 0
Net Carrying Amount 51,268,000 52,356,000
Held-to-maturity, gross unrealized gains 155,000 11,000
Held-to-maturity, gross unrealized losses (4,816,000) (3,076,000)
Total 46,607,000 49,291,000
SBA-backed securities    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 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 (140,000) (133,000)
Total 1,713,000 2,239,000
Debentures of government- sponsored agencies    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 146,050,000 145,823,000
Allowance for Credit Losses 0 0
Net Carrying Amount 146,050,000 145,823,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (28,893,000) (26,467,000)
Total 117,157,000 119,356,000
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Debt securities, held-to-maturity 62,151,000 62,500,000
Allowance for Credit Losses 0 0
Net Carrying Amount 62,151,000 62,500,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (12,066,000) (10,741,000)
Total 50,085,000 51,759,000
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 (1,794,000) (1,552,000)
Total $ 28,206,000 $ 28,448,000