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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Available-for-sale    
Amortized Cost $ 887,562 $ 899,700
Gross Unrealized Gains 15,460 24,260
Gross Unrealized Losses (6,804) (1,091)
Fair Value 896,218 922,869
Held-to-maturity    
Amortized Cost 318,730 68,395
Gross Unrealized Gains 4,155 4,064
Gross Unrealized Losses (1,729) (18)
Fair Value 321,156 72,441
Total Amortized Cost 1,206,292 968,095
Total Gross Unrealized Gains 19,615 28,324
Total Gross Unrealized Losses (8,533) (1,109)
Total Fair Value 1,217,374 995,310
U.S. Treasury    
Available-for-sale    
Amortized Cost 59,943  
Gross Unrealized Gains 374  
Gross Unrealized Losses (22)  
Fair Value 60,295  
U.S. government agency    
Available-for-sale    
Amortized Cost 130,146 118,282
Gross Unrealized Gains 1,842 3,720
Gross Unrealized Losses (2,295) (9)
Fair Value 129,693 121,993
Held-to-maturity    
Amortized Cost 12,341  
Gross Unrealized Gains 124  
Gross Unrealized Losses (12)  
Fair Value 12,453  
Municipal securities    
Available-for-sale    
Amortized Cost 295,251 265,309
Gross Unrealized Gains 6,232 9,232
Gross Unrealized Losses (2,736) (280)
Fair Value 298,747 274,261
Held-to-maturity    
Amortized Cost 18,667 22,484
Gross Unrealized Gains 998 1,390
Fair Value 19,665 23,874
Mortgage-backed: Agency residential    
Available-for-sale    
Amortized Cost 172,372 198,543
Gross Unrealized Gains 3,111 4,871
Gross Unrealized Losses (371) (162)
Fair Value 175,112 203,252
Held-to-maturity    
Amortized Cost 22,065 13,031
Gross Unrealized Gains 354 452
Gross Unrealized Losses (1)  
Fair Value 22,418 13,483
Mortgage-backed: Agency commercial    
Available-for-sale    
Amortized Cost 164,999 246,649
Gross Unrealized Gains 2,002 4,651
Gross Unrealized Losses (1,100) (534)
Fair Value 165,901 250,766
Held-to-maturity    
Amortized Cost 265,657 32,880
Gross Unrealized Gains 2,679 2,222
Gross Unrealized Losses (1,716) (18)
Fair Value 266,620 35,084
Corporate    
Available-for-sale    
Amortized Cost 64,851 70,917
Gross Unrealized Gains 1,899 1,786
Gross Unrealized Losses (280) (106)
Fair Value $ 66,470 $ 72,597