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Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Available-for-sale Securities [Abstract]    
Amortized cost $ 635,978 $ 497,004
Gross Unrealized Gains 4,892 7,107
Gross Unrealized Losses (6,863) (6,483)
Fair Value 634,007 497,628
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Held-to-maturity securities, amortized cost 62,129 68,223
Held-to-maturity securities, Gross Unrealized Gains 2,208 1,356
Held-to-maturity securities, Gross Unrealized Losses 0 (127)
Held-to-maturity, at fair value 64,337 69,452
U.S. Government-sponsored agencies    
Available-for-sale Securities [Abstract]    
Amortized cost 53,380 61,765
Gross Unrealized Gains 234 432
Gross Unrealized Losses (1,159) (1,652)
Fair Value 52,455 60,545
Municipal securities    
Available-for-sale Securities [Abstract]    
Amortized cost 76,528 82,757
Gross Unrealized Gains 1,086 463
Gross Unrealized Losses (164) (731)
Fair Value 77,450 82,489
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Held-to-maturity securities, amortized cost 14,538 14,571
Held-to-maturity securities, Gross Unrealized Gains 781 746
Held-to-maturity securities, Gross Unrealized Losses 0 0
Held-to-maturity, at fair value 15,319 15,317
Agency mortgage-backed securities    
Available-for-sale Securities [Abstract]    
Amortized cost 432,613 241,795
Gross Unrealized Gains 2,364 4,591
Gross Unrealized Losses (5,092) (2,465)
Fair Value 429,885 243,921
Private label mortgage-backed securities    
Available-for-sale Securities [Abstract]    
Amortized cost 19,997 57,268
Gross Unrealized Gains 238 850
Gross Unrealized Losses 0 (2)
Fair Value 20,235 58,116
Asset-backed securities    
Available-for-sale Securities [Abstract]    
Amortized cost 5,000 5,000
Gross Unrealized Gains 5 0
Gross Unrealized Losses 0 (39)
Fair Value 5,005 4,961
Corporate securities    
Available-for-sale Securities [Abstract]    
Amortized cost 48,460 48,419
Gross Unrealized Gains 965 771
Gross Unrealized Losses (448) (1,594)
Fair Value 48,977 47,596
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]    
Held-to-maturity securities, amortized cost 47,591 53,652
Held-to-maturity securities, Gross Unrealized Gains 1,427 610
Held-to-maturity securities, Gross Unrealized Losses 0 (127)
Held-to-maturity, at fair value $ 49,018 $ 54,135