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Investment Securities - Available-for-Sale Securities Amortized Cost and Fair Value (Details) - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost $ 856,166,000 $ 892,605,000
Available-for-sale, gross unrealized gains 69,000 34,000
Available-for-sale, gross unrealized losses (85,293,000) (90,543,000)
Allowance for Credit Losses 0 0
Fair Value $ 770,942,000 $ 802,096,000
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Interest receivable and other assets Interest receivable and other assets
Accrued interest $ 3,100,000 $ 3,200,000
MBS pass-through securities issued by FHLMC, FNMA and GNMA    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 102,420,000 109,736,000
Available-for-sale, gross unrealized gains 2,000 3,000
Available-for-sale, gross unrealized losses (11,758,000) (12,133,000)
Allowance for Credit Losses 0 0
Fair Value 90,664,000 97,606,000
CMOs issued by FHLMC    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 333,374,000 347,437,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (32,162,000) (33,682,000)
Allowance for Credit Losses 0 0
Fair Value 301,212,000 313,755,000
CMOs issued by FNMA    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 32,916,000 36,172,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (3,816,000) (3,852,000)
Allowance for Credit Losses 0 0
Fair Value 29,100,000 32,320,000
CMOs issued by GNMA    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 32,193,000 35,120,000
Available-for-sale, gross unrealized gains 31,000 0
Available-for-sale, gross unrealized losses (3,377,000) (3,296,000)
Allowance for Credit Losses 0 0
Fair Value 28,847,000 31,824,000
SBA-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 39,824,000 47,724,000
Available-for-sale, gross unrealized gains 0 2,000
Available-for-sale, gross unrealized losses (3,175,000) (3,371,000)
Allowance for Credit Losses 0 0
Fair Value 36,649,000 44,355,000
Debentures of government- sponsored agencies    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 149,129,000 149,114,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (13,261,000) (14,008,000)
Allowance for Credit Losses 0 0
Fair Value 135,868,000 135,106,000
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 11,914,000 11,904,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (1,580,000) (1,635,000)
Allowance for Credit Losses 0
Fair Value 10,334,000 10,269,000
Obligations of state and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 116,040,000 116,855,000
Available-for-sale, gross unrealized gains 36,000 29,000
Available-for-sale, gross unrealized losses (13,160,000) (14,761,000)
Allowance for Credit Losses 0 0
Fair Value 102,916,000 102,123,000
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 36,991,000 36,990,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (2,948,000) (3,714,000)
Allowance for Credit Losses 0 0
Fair Value 34,043,000 33,276,000
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 1,365,000 1,553,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (56,000) (91,000)
Allowance for Credit Losses 0 0
Fair Value $ 1,309,000 $ 1,462,000