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Investment Securities - Schedule of Available-for-Sale Securities Amortized Cost and Fair Value (Details) - USD ($)
Sep. 30, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost $ 755,038,000 $ 892,605,000
Available-for-sale, gross unrealized gains 2,000 34,000
Available-for-sale, gross unrealized losses (96,225,000) (90,543,000)
Allowance for Credit Losses 0 0
Fair Value $ 658,815,000 $ 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 $ 2,700,000 $ 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 84,654,000 109,736,000
Available-for-sale, gross unrealized gains 2,000 3,000
Available-for-sale, gross unrealized losses (13,263,000) (12,133,000)
Allowance for Credit Losses 0 0
Fair Value 71,393,000 97,606,000
CMOs issued by FHLMC    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 307,119,000 347,437,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (37,236,000) (33,682,000)
Allowance for Credit Losses 0 0
Fair Value 269,883,000 313,755,000
CMOs issued by FNMA    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 30,832,000 36,172,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (4,012,000) (3,852,000)
Allowance for Credit Losses 0 0
Fair Value 26,820,000 32,320,000
CMOs issued by GNMA    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 20,505,000 35,120,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (3,668,000) (3,296,000)
Allowance for Credit Losses 0 0
Fair Value 16,837,000 31,824,000
SBA-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 31,389,000 47,724,000
Available-for-sale, gross unrealized gains 0 2,000
Available-for-sale, gross unrealized losses (3,166,000) (3,371,000)
Allowance for Credit Losses 0 0
Fair Value 28,223,000 44,355,000
Debentures of government- sponsored agencies    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 129,137,000 149,114,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (11,971,000) (14,008,000)
Allowance for Credit Losses 0 0
Fair Value 117,166,000 135,106,000
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 11,918,000 11,904,000
Available-for-sale, gross unrealized gains 0 0
Available-for-sale, gross unrealized losses (1,703,000) (1,635,000)
Allowance for Credit Losses 0
Fair Value 10,215,000 10,269,000
Obligations of state and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost 102,493,000 116,855,000
Available-for-sale, gross unrealized gains 0 29,000
Available-for-sale, gross unrealized losses (18,771,000) (14,761,000)
Allowance for Credit Losses 0 0
Fair Value 83,722,000 102,123,000
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 (2,435,000) (3,714,000)
Allowance for Credit Losses 0 0
Fair Value $ 34,556,000 33,276,000
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale, amortized cost   1,553,000
Available-for-sale, gross unrealized gains   0
Available-for-sale, gross unrealized losses   (91,000)
Allowance for Credit Losses   0
Fair Value   $ 1,462,000