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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Investment Holdings [Line Items]
Total	$ 112,456	$ 131,687
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	3,101	5,011
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(386)	0
Held-to-Maturity Market Value	115,171	136,698
Total	3,885,363	3,330,029
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	84,756	99,942
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(14,280)	(5,391)
Investment securities available-for-sale	3,955,839	3,424,580
U.S. Treasuries
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	20,218	99
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	220	4
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	0	0
Investment securities available-for-sale	20,438	103
Securities of U.S. government agencies and corporations
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	78,311	60
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	798	0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(4)	0
Investment securities available-for-sale	79,105	60
Residential Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Total	0	13,990
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	197
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	14,187
Total	686,994	704,482
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	11,127	15,938
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(6,758)	(237)
Investment securities available-for-sale	691,363	720,183
Commercial Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Total	56,833	71,737
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,828	3,485
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	58,661	75,222
Total	685,920	584,125
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	8,384	10,395
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(567)	(3,584)
Investment securities available-for-sale	693,737	590,936
Collateralized Mortgage Backed Securities [Member]
Investment Holdings [Line Items]
Total	14,985	5,799
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	162	79
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(85)	0
Held-to-Maturity Market Value	15,062	5,878
Total	740,172	634,418
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	14,785	21,148
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(2,690)	(445)
Investment securities available-for-sale	752,267	655,121
Obligations of state and other political subdivisions
Investment Holdings [Line Items]
Total	9,388	9,911
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,003	1,239
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	10,391	11,150
Total	978,919	856,054
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	43,085	46,755
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(3,587)	(291)
Investment securities available-for-sale	1,018,417	902,518
Asset-backed Securities [Member]
Investment Holdings [Line Items]
Total	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Held-to-Maturity Market Value	0	0
Total	599,326	478,539
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	4,061	4,158
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(638)	(826)
Investment securities available-for-sale	602,749	481,871
Other securities
Investment Holdings [Line Items]
Total	31,250	30,250
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	108	11
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(301)	0
Held-to-Maturity Market Value	31,057	30,261
Total	95,503	72,252
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments	2,296	1,544
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments	(36)	(8)
Investment securities available-for-sale	$ 97,763	$ 73,788

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