FAIR VALUE, Carrying Amounts and Estimated Fair Values of Other Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Carrying Value [Member]
Financial assets [Abstract]
Net loans	$ 4,755,974	$ 4,190,865
Financial liabilities [Abstract]
Deposits	6,873,474	5,935,264
Borrowings	301,300	338,000
Subordinated debt held by unconsolidated subsidiary trusts	102,146	102,122
Fair Value [Member]
Financial assets [Abstract]
Net loans	4,808,856	4,251,565
Financial liabilities [Abstract]
Deposits	6,871,098	5,935,690
Borrowings	301,300	338,000
Subordinated debt held by unconsolidated subsidiary trusts	$ 84,680	$ 85,189