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Investment Securities - Held-to-Maturity Amortized Cost and Fair Value (Details) - USD ($)
Mar. 31, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost $ 958,560,000 $ 972,207,000
Allowance for Credit Losses 0 0
Net Carrying Amount 958,560,000 972,207,000
Held-to-maturity, gross unrealized gains 503,000 70,000
Held-to-maturity, gross unrealized losses (108,938,000) (127,038,000)
Held to maturity, fair value 850,125,000 845,239,000
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]    
Held to maturity, amortized cost 322,691,000 331,281,000
Allowance for Credit Losses 0 0
Net Carrying Amount 322,691,000 331,281,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (45,007,000) (50,147,000)
Held to maturity, fair value 277,684,000 281,134,000
CMOs issued by FHLMC    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 233,796,000 235,971,000
Allowance for Credit Losses 0 0
Net Carrying Amount 233,796,000 235,971,000
Held-to-maturity, gross unrealized gains 139,000 59,000
Held-to-maturity, gross unrealized losses (24,973,000) (29,503,000)
Held to maturity, fair value 208,962,000 206,527,000
CMOs issued by FNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 109,694,000 111,904,000
Allowance for Credit Losses 0 0
Net Carrying Amount 109,694,000 111,904,000
Held-to-maturity, gross unrealized gains 176,000 0
Held-to-maturity, gross unrealized losses (3,729,000) (5,419,000)
Held to maturity, fair value 106,141,000 106,485,000
CMOs issued by GNMA    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 52,120,000 52,356,000
Allowance for Credit Losses 0 0
Net Carrying Amount 52,120,000 52,356,000
Held-to-maturity, gross unrealized gains 164,000 11,000
Held-to-maturity, gross unrealized losses (3,020,000) (3,076,000)
Held to maturity, fair value 49,264,000 49,291,000
SBA-backed securities    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 1,977,000 2,372,000
Allowance for Credit Losses 0 0
Net Carrying Amount 1,977,000 2,372,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (99,000) (133,000)
Held to maturity, fair value 1,878,000 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 145,898,000 145,823,000
Allowance for Credit Losses 0 0
Net Carrying Amount 145,898,000 145,823,000
Held-to-maturity, gross unrealized gains 0 0
Held-to-maturity, gross unrealized losses (22,149,000) (26,467,000)
Held to maturity, fair value 123,749,000 119,356,000
Obligations of state and political subdivisions    
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]    
Held to maturity, amortized cost 62,384,000 62,500,000
Allowance for Credit Losses 0 0
Net Carrying Amount 62,384,000 62,500,000
Held-to-maturity, gross unrealized gains 24,000 0
Held-to-maturity, gross unrealized losses (8,728,000) (10,741,000)
Held to maturity, fair value 53,680,000 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 (1,233,000) (1,552,000)
Held to maturity, fair value $ 28,767,000 $ 28,448,000