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INVESTMENT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
AFS
Amortized cost	$ 950,878	$ 1,027,338
Gross unrealized gains	31,028	45,568
Gross unrealized losses	(3,063)	(813)
Fair value of debt securities available for sale	978,843	1,072,093
Residential mortgage-backed securities
AFS
Amortized cost	33,046	50,001
Gross unrealized gains	719	1,237
Gross unrealized losses	(298)	(192)
Fair value of debt securities available for sale	33,467	51,046
Commercial mortgage-backed securities
AFS
Amortized cost	40,995	43,061
Gross unrealized gains	1,231	2,131
Gross unrealized losses	(176)	(8)
Fair value of debt securities available for sale	42,050	45,184
Residential collateralized mortgage obligations
AFS
Amortized cost	182,060	228,685
Gross unrealized gains	3,283	6,319
Gross unrealized losses	(983)	(95)
Fair value of debt securities available for sale	184,360	234,909
Commercial collateralized mortgage obligations
AFS
Amortized cost	139,202	155,645
Gross unrealized gains	2,368	3,719
Gross unrealized losses	(246)	(181)
Fair value of debt securities available for sale	141,324	159,183
Municipal bonds
AFS
Amortized cost	513,151	533,719
Gross unrealized gains	22,558	31,321
Gross unrealized losses	(1,308)	(337)
Fair value of debt securities available for sale	534,401	564,703
HTM
Amortized cost	4,195	4,271
Gross unrealized gains	154	236
Gross unrealized losses	0	0
Fair value	4,349	4,507
Corporate debt securities
AFS
Amortized cost	18,990	14,381
Gross unrealized gains	859	841
Gross unrealized losses	0	0
Fair value of debt securities available for sale	19,849	15,222
U.S. Treasury securities
AFS
Amortized cost	23,434
Gross unrealized gains	10
Gross unrealized losses	(52)
Fair value of debt securities available for sale	$ 23,392
Agency debentures
AFS
Amortized cost		1,846
Gross unrealized gains		0
Gross unrealized losses		0
Fair value of debt securities available for sale		$ 1,846

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