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INVESTMENT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
AFS
Amortized cost	$ 968,189	$ 1,027,338
Gross unrealized gains	37,219	45,568
Gross unrealized losses	(1,971)	(813)
Fair value of debt securities available for sale	1,003,437	1,072,093
Residential mortgage-backed securities
AFS
Amortized cost	37,116	50,001
Gross unrealized gains	763	1,237
Gross unrealized losses	(292)	(192)
Fair value of debt securities available for sale	37,587	51,046
Commercial mortgage-backed securities
AFS
Amortized cost	41,333	43,061
Gross unrealized gains	1,499	2,131
Gross unrealized losses	(94)	(8)
Fair value of debt securities available for sale	42,738	45,184
Residential collateralized mortgage obligations
AFS
Amortized cost	191,914	228,685
Gross unrealized gains	4,261	6,319
Gross unrealized losses	(841)	(95)
Fair value of debt securities available for sale	195,334	234,909
Commercial collateralized mortgage obligations
AFS
Amortized cost	141,061	155,645
Gross unrealized gains	2,704	3,719
Gross unrealized losses	(365)	(181)
Fair value of debt securities available for sale	143,400	159,183
Municipal bonds
AFS
Amortized cost	519,186	533,719
Gross unrealized gains	27,010	31,321
Gross unrealized losses	(379)	(337)
Fair value of debt securities available for sale	545,817	564,703
HTM
Amortized cost	4,221	4,271
Gross unrealized gains	177	236
Gross unrealized losses	0	0
Fair value	4,398	4,507
Corporate debt securities
AFS
Amortized cost	14,060	14,381
Gross unrealized gains	915	841
Gross unrealized losses	0	0
Fair value of debt securities available for sale	14,975	15,222
U.S. Treasury securities
AFS
Amortized cost	23,519
Gross unrealized gains	67
Gross unrealized losses	0
Fair value of debt securities available for sale	$ 23,586
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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