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Investment Securities - Investment Securities by Classification Type and Maturity (Details) - USD ($)
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 883,832,000 $ 770,195,000
Gross Unrealized Gains 15,341,000 32,521,000
Gross Unrealized Losses (4,838,000) (553,000)
Fair Value 894,335,000 802,163,000
Total 383,393,000 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 120,000  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (7,182,000)  
Total 376,331,000 0
U.S. government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 21,494,000 44,713,000
Gross Unrealized Gains 55,000 947,000
Gross Unrealized Losses (176,000) 0
Fair Value 21,373,000 45,660,000
Total 141,011,000  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 120,000  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (1,768,000)  
Total 139,363,000  
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 213,158,000 197,634,000
Gross Unrealized Gains 8,908,000 12,561,000
Gross Unrealized Losses (854,000) (227,000)
Fair Value 221,212,000 209,968,000
Residential CMO and MBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 307,366,000 196,956,000
Gross Unrealized Gains 2,111,000 5,125,000
Gross Unrealized Losses (2,593,000) (209,000)
Fair Value 306,884,000 201,872,000
Total 24,529,000  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (153,000)  
Total 24,376,000  
Commercial CMO and MBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 313,169,000 290,638,000
Gross Unrealized Gains 3,891,000 13,198,000
Gross Unrealized Losses (1,199,000) (90,000)
Fair Value 315,861,000 303,746,000
Total 217,853,000  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (5,261,000)  
Total 212,592,000  
Corporate obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 2,007,000 10,971,000
Gross Unrealized Gains 7,000 125,000
Gross Unrealized Losses 0 0
Fair Value 2,014,000 11,096,000
Other asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 26,638,000 29,283,000
Gross Unrealized Gains 369,000 565,000
Gross Unrealized Losses (16,000) (27,000)
Fair Value $ 26,991,000 $ 29,821,000