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FAIR VALUE MEASUREMENTS - Summary of Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial Assets
Trading security	$ 10,769	$ 11,212
Marketable equity securities	41,556	56,638
Securities available for sale	1,311,555	1,399,647
Securities held to maturity	373,277	371,224
FHLB stock and restricted equity securities	48,019	77,344
Accrued interest receivable	36,462	36,879
Level 1
Financial Assets
Cash and cash equivalents	579,829	183,189
Trading security	0	0
Marketable equity securities	40,499	56,074
Securities available for sale	0	0
Securities held to maturity	0	0
Net loans	0	0
Loans held for sale	0	0
Accrued interest receivable	0	0
Derivative assets	0	0
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term FHLB advances	0	0
Subordinated notes	0	0
Derivative liabilities	227	734
Level 2
Financial Assets
Cash and cash equivalents	0	0
Trading security	0	0
Marketable equity securities	1,056	564
Securities available for sale	1,267,573	1,399,647
Securities held to maturity	355,513	353,182
Net loans	0	0
Loans held for sale	140,280	96,233
Accrued interest receivable	36,462	36,879
Derivative assets	77,562	31,727
Financial Liabilities
Total deposits	10,338,993	8,970,321
Short-term debt	125,081	1,118,820
Long-term FHLB advances	606,381	308,336
Subordinated notes	101,055	97,376
Derivative liabilities	80,454	33,239
Level 3
Financial Assets
Cash and cash equivalents	0	0
Trading security	10,769	11,212
Marketable equity securities	0	0
Securities available for sale	43,982	0
Securities held to maturity	17,764	18,042
Net loans	9,653,550	9,026,442
Loans held for sale	29,039	0
Accrued interest receivable	0	0
Derivative assets	2,628	3,927
Financial Liabilities
Total deposits	0	0
Short-term debt	0	0
Long-term FHLB advances	0	0
Subordinated notes	0	0
Derivative liabilities	0	0
Carrying Amount
Financial Assets
Cash and cash equivalents	579,829	183,189
Trading security	10,769	11,212
Marketable equity securities	41,556	56,638
Securities available for sale	1,311,555	1,399,647
Securities held to maturity	357,979	373,763
FHLB stock and restricted equity securities	48,019	77,344
Net loans	9,438,853	8,981,784
Loans held for sale	169,319	96,233
Accrued interest receivable	36,462	36,879
Derivative assets	80,190	35,654
Financial Liabilities
Total deposits	10,335,977	8,982,381
Short-term debt	125,000	1,118,832
Long-term FHLB advances	605,501	309,466
Subordinated notes	97,049	89,518
Derivative liabilities	80,681	33,973
Fair Value
Financial Assets
Cash and cash equivalents	579,829	183,189
Trading security	10,769	11,212
Marketable equity securities	41,555	56,638
Securities available for sale	1,311,555	1,399,647
Securities held to maturity	373,277	371,224
Net loans	9,653,550	9,026,442
Loans held for sale	169,319	96,233
Accrued interest receivable	36,462	36,879
Derivative assets	80,190	35,654
Financial Liabilities
Total deposits	10,338,993	8,970,321
Short-term debt	125,081	1,118,820
Long-term FHLB advances	606,381	308,336
Subordinated notes	101,055	97,376
Derivative liabilities	$ 80,681	$ 33,973

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