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INVESTMENT SECURITIES - Amortized Cost, Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale Debt Securities:
Amortized cost	$ 975,763	$ 1,027,338
Gross unrealized gains	30,084	45,568
Gross unrealized losses	(3,325)	(813)
Fair value	1,002,522	1,072,093
Residential Mortgage Backed Securities
Available-for-sale Debt Securities:
Amortized cost	32,905	50,001
Gross unrealized gains	396	1,237
Gross unrealized losses	(338)	(192)
Fair value	32,963	51,046
Commercial Mortgage Backed Securities
Available-for-sale Debt Securities:
Amortized cost	62,094	43,061
Gross unrealized gains	933	2,131
Gross unrealized losses	(235)	(8)
Fair value	62,792	45,184
Collateralized Residential Mortgage Obligations
Available-for-sale Debt Securities:
Amortized cost	186,703	228,685
Gross unrealized gains	2,012	6,319
Gross unrealized losses	(1,321)	(95)
Fair value	187,394	234,909
Collateralized Commercial Mortgage Obligations
Available-for-sale Debt Securities:
Amortized cost	135,102	155,645
Gross unrealized gains	1,890	3,719
Gross unrealized losses	(333)	(181)
Fair value	136,659	159,183
Municipal bonds
Available-for-sale Debt Securities:
Amortized cost	516,693	533,719
Gross unrealized gains	24,154	31,321
Gross unrealized losses	(924)	(337)
Fair value	539,923	564,703
Held-to-maturity Securities
Amortized cost	4,169	4,271
Gross unrealized gains	136	236
Gross unrealized losses	0	0
Fair value	4,305	4,507
Corporate debt securities
Available-for-sale Debt Securities:
Amortized cost	18,918	14,381
Gross unrealized gains	699	841
Gross unrealized losses	(1)	0
Fair value	19,616	15,222
U.S. Treasury securities
Available-for-sale Debt Securities:
Amortized cost	23,348
Gross unrealized gains	0
Gross unrealized losses	(173)
Fair value	$ 23,175
Agency debentures
Available-for-sale Debt Securities:
Amortized cost		1,846
Gross unrealized gains		0
Gross unrealized losses		0
Fair value		$ 1,846

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