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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Values (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Investment Holdings [Line Items]    
Amortized Cost $ 1,085,016 $ 883,832
Gross Unrealized Gains 2,890 15,341
Gross Unrealized Losses (47,982) (4,838)
Fair Value 1,039,924 894,335
Total investment securities 422,213 383,393
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 120
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (37,391) (7,182)
Total investment securities 384,822 376,331
Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value   894,335
Level 2 | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value   894,335
U.S. government and agency securities    
Investment Holdings [Line Items]    
Amortized Cost 41,489 21,494
Gross Unrealized Gains 0 55
Gross Unrealized Losses (1,934) (176)
Total investment securities 150,973 141,011
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 120
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (14,344) (1,768)
Total investment securities 136,629 139,363
U.S. government and agency securities | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value 39,555 21,373
U.S. government and agency securities | Level 2    
Investment Holdings [Line Items]    
Fair Value 39,555  
U.S. government and agency securities | Level 2 | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value   21,373
Municipal securities    
Investment Holdings [Line Items]    
Amortized Cost 215,488 213,158
Gross Unrealized Gains 1,964 8,908
Gross Unrealized Losses (7,213) (854)
Municipal securities | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value 210,239 221,212
Municipal securities | Level 2    
Investment Holdings [Line Items]    
Fair Value 210,239  
Municipal securities | Level 2 | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value   221,212
Residential CMO and MBS    
Investment Holdings [Line Items]    
Amortized Cost 378,934 307,366
Gross Unrealized Gains 219 2,111
Gross Unrealized Losses (20,744) (2,593)
Total investment securities 54,486 24,529
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (2,936) (153)
Total investment securities 51,550 24,376
Residential CMO and MBS | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value 358,409 306,884
Residential CMO and MBS | Level 2    
Investment Holdings [Line Items]    
Fair Value 358,409  
Residential CMO and MBS | Level 2 | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value   306,884
Commercial CMO and MBS    
Investment Holdings [Line Items]    
Amortized Cost 421,696 313,169
Gross Unrealized Gains 615 3,891
Gross Unrealized Losses (17,806) (1,199)
Total investment securities 216,754 217,853
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (20,111) (5,261)
Total investment securities 196,643 212,592
Commercial CMO and MBS | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value 404,505 315,861
Commercial CMO and MBS | Level 2    
Investment Holdings [Line Items]    
Fair Value 404,505  
Commercial CMO and MBS | Level 2 | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value   315,861
Corporate obligations    
Investment Holdings [Line Items]    
Amortized Cost 2,005 2,007
Gross Unrealized Gains 4 7
Gross Unrealized Losses 0 0
Corporate obligations | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value 2,009 2,014
Corporate obligations | Level 2    
Investment Holdings [Line Items]    
Fair Value 2,009  
Corporate obligations | Level 2 | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value   2,014
Other asset-backed securities    
Investment Holdings [Line Items]    
Amortized Cost 25,404 26,638
Gross Unrealized Gains 88 369
Gross Unrealized Losses (285) (16)
Other asset-backed securities | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value 25,207 26,991
Other asset-backed securities | Level 2    
Investment Holdings [Line Items]    
Fair Value $ 25,207  
Other asset-backed securities | Level 2 | Fair Value, Recurring [Member]    
Investment Holdings [Line Items]    
Fair Value   $ 26,991