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FAIR VALUE OF FINANCIAL INSTRUMENTS (Fair Value By Balance Sheet Location) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Assets:    
Trading Securities, Fair Value $ 25,896 $ 22,318
Securities—available-for-sale 1,636,223 919,485
Loans Held-for-sale, Fair Value 164,800 32,400
Liabilities:    
Advances from FHLB 540,189 202
Fair Value, Measurements, Recurring [Member]    
Assets:    
Trading Securities, Fair Value 25,896 22,318
Securities—available-for-sale 1,636,223 919,485
Assets, Fair Value Disclosure 1,830,847 979,801
Liabilities:    
Junior subordinated debentures at fair value 114,091 98,707
Financial and Nonfinancial Liabilities, Fair Value Disclosure 118,883 103,991
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]    
Assets:    
Derivatives 471 5,083
Liabilities:    
Derivatives 1,654 5,083
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]    
Assets:    
Derivatives 3,138 523
Liabilities:    
Derivatives 3,138 201
Fair Value, Measurements, Recurring [Member] | U.S. Government and agency obligations    
Assets:    
Securities—available-for-sale 149,112 72,466
Fair Value, Measurements, Recurring [Member] | Municipal bonds    
Assets:    
Trading Securities, Fair Value   100
Securities—available-for-sale 117,822 68,733
Fair Value, Measurements, Recurring [Member] | Corporate bonds    
Assets:    
Securities—available-for-sale 3,495 5,393
Fair Value, Measurements, Recurring [Member] | TPS and TRUP CDOs [Member]    
Assets:    
Trading Securities, Fair Value 25,896 22,058
Fair Value, Measurements, Recurring [Member] | Mortgage Backed Securities, Other [Member]    
Assets:    
Securities—available-for-sale 1,343,861 739,557
Fair Value, Measurements, Recurring [Member] | Equity securities    
Assets:    
Trading Securities, Fair Value   160
Securities—available-for-sale   5,578
Fair Value, Measurements, Recurring [Member] | Asset-backed securities    
Assets:    
Securities—available-for-sale 21,933 27,758
Fair Value, Measurements, Recurring [Member] | Loans [Member]    
Assets:    
Loans Held-for-sale, Fair Value 164,767 32,392
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]    
Assets:    
Trading Securities, Fair Value 0 0
Securities—available-for-sale 0 0
Assets, Fair Value Disclosure 0 0
Liabilities:    
Junior subordinated debentures at fair value 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest Rate Contract [Member]    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Interest Rate Swap [Member]    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Government and agency obligations    
Assets:    
Securities—available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Municipal bonds    
Assets:    
Trading Securities, Fair Value   0
Securities—available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate bonds    
Assets:    
Securities—available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | TPS and TRUP CDOs [Member]    
Assets:    
Trading Securities, Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Mortgage Backed Securities, Other [Member]    
Assets:    
Securities—available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Equity securities    
Assets:    
Trading Securities, Fair Value   0
Securities—available-for-sale   0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Asset-backed securities    
Assets:    
Securities—available-for-sale 0  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Loans [Member]    
Assets:    
Loans Held-for-sale, Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]    
Assets:    
Trading Securities, Fair Value 0 260
Securities—available-for-sale 1,636,223 919,485
Assets, Fair Value Disclosure 1,804,951 957,743
Liabilities:    
Junior subordinated debentures at fair value 0 0
Financial and Nonfinancial Liabilities, Fair Value Disclosure 4,792 5,284
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Contract [Member]    
Assets:    
Derivatives 471 5,083
Liabilities:    
Derivatives 1,654 5,083
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Interest Rate Swap [Member]    
Assets:    
Derivatives 3,138 523
Liabilities:    
Derivatives 3,138 201
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government and agency obligations    
Assets:    
Securities—available-for-sale 149,112 72,466
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Municipal bonds    
Assets:    
Trading Securities, Fair Value   100
Securities—available-for-sale 117,822 68,733
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate bonds    
Assets:    
Securities—available-for-sale 3,495 5,393
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | TPS and TRUP CDOs [Member]    
Assets:    
Trading Securities, Fair Value 0 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Mortgage Backed Securities, Other [Member]    
Assets:    
Securities—available-for-sale 1,343,861 739,557
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Equity securities    
Assets:    
Trading Securities, Fair Value   160
Securities—available-for-sale   5,578
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Asset-backed securities    
Assets:    
Securities—available-for-sale 21,933 27,758
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Loans [Member]    
Assets:    
Loans Held-for-sale, Fair Value 164,767 32,392
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]    
Assets:    
Trading Securities, Fair Value 25,896 22,058
Securities—available-for-sale 0 0
Assets, Fair Value Disclosure 25,896 22,058
Liabilities:    
Junior subordinated debentures at fair value 114,091 98,707
Financial and Nonfinancial Liabilities, Fair Value Disclosure 114,091 98,707
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest Rate Contract [Member]    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Interest Rate Swap [Member]    
Assets:    
Derivatives 0 0
Liabilities:    
Derivatives 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Government and agency obligations    
Assets:    
Securities—available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Municipal bonds    
Assets:    
Trading Securities, Fair Value   0
Securities—available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate bonds    
Assets:    
Securities—available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | TPS and TRUP CDOs [Member]    
Assets:    
Trading Securities, Fair Value 25,896 22,058
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Mortgage Backed Securities, Other [Member]    
Assets:    
Securities—available-for-sale 0 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Equity securities    
Assets:    
Trading Securities, Fair Value   0
Securities—available-for-sale   0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Asset-backed securities    
Assets:    
Securities—available-for-sale 0  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Loans [Member]    
Assets:    
Loans Held-for-sale, Fair Value $ 0 $ 0