SECURITIES - Investments in a Continuous Unrealized Loss Position (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) item	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Available-for-sale: Unrealized Loss
Less than 12 Months	$ (62,524)		$ (62,524)		$ (7,334)
12 Months or More	(35,922)		(35,922)		(1,654)
Total Unrealized Loss of Available-for-sale securities	(98,446)		(98,446)		(8,988)
Held-to-maturity: Unrealized Loss
Less than 12 Months	(34,297)		(34,297)		(2,826)
12 Months or More	(30,755)		(30,755)		(128)
Total Unrealized Loss of Held-to-maturity securities	(65,052)		(65,052)		(2,954)
Available-for-sale: Fair Value
Less than 12 Months	672,731		672,731		445,604
12 Months or More	168,900		168,900		38,324
Total Fair Value Available-for-sale securities	841,631		841,631		483,928
Held-to-maturity: Fair value
Less than 12 Months	303,231		303,231		194,309
12 Months or More	171,990		171,990		2,776
Total Fair Value Held-to-maturity securities	475,221		475,221		197,085
Total: Unrealized Losses
Less Than 12 Months	(96,821)		(96,821)		(10,160)
12 Months or More	(66,677)		(66,677)		(1,782)
Total Unrealized Losses	(163,498)		(163,498)		(11,942)
Total: Fair Value
Less than 12 Months	975,962		975,962		639,913
12 Months or More	340,890		340,890		41,100
Total Fair Value	$ 1,316,852		$ 1,316,852		681,013
Number of securities in an unrealized loss position for a period of twelve months or more | item	183		183
Number of securities in an unrealized loss position for a period of less than twelve months | item	641		641
Proceeds from sales of securities available-for-sale	$ 0	$ 0	$ 0	$ 0
U.S. Treasury
Available-for-sale: Unrealized Loss
Less than 12 Months	(15,245)		(15,245)		(354)
12 Months or More	(1,078)		(1,078)
Total Unrealized Loss of Available-for-sale securities	(16,323)		(16,323)		(354)
Available-for-sale: Fair Value
Less than 12 Months	144,691		144,691		68,410
12 Months or More	8,881		8,881
Total Fair Value Available-for-sale securities	153,572		153,572		68,410
U.S. government agency
Available-for-sale: Unrealized Loss
Less than 12 Months	(3,831)		(3,831)		(2,183)
12 Months or More	(575)		(575)		(284)
Total Unrealized Loss of Available-for-sale securities	(4,406)		(4,406)		(2,467)
Held-to-maturity: Unrealized Loss
Less than 12 Months	(2,316)		(2,316)		(51)
12 Months or More	(8,026)		(8,026)
Total Unrealized Loss of Held-to-maturity securities	(10,342)		(10,342)		(51)
Available-for-sale: Fair Value
Less than 12 Months	51,799		51,799		80,219
12 Months or More	3,394		3,394		5,578
Total Fair Value Available-for-sale securities	55,193		55,193		85,797
Held-to-maturity: Fair value
Less than 12 Months	20,176		20,176		4,949
12 Months or More	57,900		57,900
Total Fair Value Held-to-maturity securities	78,076		78,076		4,949
Municipal securities
Available-for-sale: Unrealized Loss
Less than 12 Months	(16,557)		(16,557)		(2,018)
12 Months or More	(21,247)		(21,247)		(886)
Total Unrealized Loss of Available-for-sale securities	(37,804)		(37,804)		(2,904)
Held-to-maturity: Unrealized Loss
Less than 12 Months	(1,357)		(1,357)
Total Unrealized Loss of Held-to-maturity securities	(1,357)		(1,357)
Available-for-sale: Fair Value
Less than 12 Months	157,183		157,183		89,424
12 Months or More	82,613		82,613		17,327
Total Fair Value Available-for-sale securities	239,796		239,796		106,751
Held-to-maturity: Fair value
Less than 12 Months	35,066		35,066
Total Fair Value Held-to-maturity securities	35,066		35,066
Mortgage-backed: Agency residential
Available-for-sale: Unrealized Loss
Less than 12 Months	(15,072)		(15,072)		(851)
12 Months or More	(3,779)		(3,779)		(68)
Total Unrealized Loss of Available-for-sale securities	(18,851)		(18,851)		(919)
Held-to-maturity: Unrealized Loss
Less than 12 Months	(6,320)		(6,320)		(102)
12 Months or More	(171)		(171)
Total Unrealized Loss of Held-to-maturity securities	(6,491)		(6,491)		(102)
Available-for-sale: Fair Value
Less than 12 Months	176,467		176,467		91,703
12 Months or More	24,808		24,808		4,305
Total Fair Value Available-for-sale securities	201,275		201,275		96,008
Held-to-maturity: Fair value
Less than 12 Months	97,876		97,876		14,932
12 Months or More	963		963
Total Fair Value Held-to-maturity securities	98,839		98,839		14,932
Mortgage-backed: Agency commercial
Available-for-sale: Unrealized Loss
Less than 12 Months	(9,292)		(9,292)		(1,921)
12 Months or More	(8,010)		(8,010)		(127)
Total Unrealized Loss of Available-for-sale securities	(17,302)		(17,302)		(2,048)
Held-to-maturity: Unrealized Loss
Less than 12 Months	(24,304)		(24,304)		(2,673)
12 Months or More	(22,558)		(22,558)		(128)
Total Unrealized Loss of Held-to-maturity securities	(46,862)		(46,862)		(2,801)
Available-for-sale: Fair Value
Less than 12 Months	89,378		89,378		113,111
12 Months or More	45,474		45,474		6,443
Total Fair Value Available-for-sale securities	134,852		134,852		119,554
Held-to-maturity: Fair value
Less than 12 Months	150,113		150,113		174,428
12 Months or More	113,127		113,127		2,776
Total Fair Value Held-to-maturity securities	263,240		263,240		177,204
Corporate
Available-for-sale: Unrealized Loss
Less than 12 Months	(2,527)		(2,527)		(7)
12 Months or More	(1,233)		(1,233)		(289)
Total Unrealized Loss of Available-for-sale securities	(3,760)		(3,760)		(296)
Available-for-sale: Fair Value
Less than 12 Months	53,213		53,213		2,737
12 Months or More	3,730		3,730		4,671
Total Fair Value Available-for-sale securities	$ 56,943		$ 56,943		$ 7,408