LOANS AND ALLOWANCE FOR LOAN AND LEASE LOSSES - RISK CATEGORY (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Risk category of rated loans
Loans	$ 3,823,031,000	$ 3,326,610,000
Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	1,028,471,000	1,081,934,000
Owner Occupied - Correspondent
Risk category of rated loans
Loans	159,955,000	249,344,000
Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	149,610,000	116,294,000
Commercial Real Estate
Risk category of rated loans
Loans	999,852,000	824,887,000
Commercial real estate - purchased whole loans
Risk category of rated loans
Loans	36,085,000	35,674,000
Construction & land development
Risk category of rated loans
Loans	94,289,000	66,500,000
Commercial & Industrial
Risk category of rated loans
Loans	250,094,000	229,721,000
Lease Financing Receivables
Risk category of rated loans
Loans	12,186,000	8,905,000
Warehouse lines of credit
Risk category of rated loans
Loans	661,186,000	386,729,000
Home equity lines of credit
Risk category of rated loans
Loans	335,116,000	289,194,000
Consumer: Republic Processing Group Loans
Risk category of rated loans
Loans	16,453,000	7,204,000
Consumer: Credit cards
Risk category of rated loans
Loans	12,581,000	11,068,000
Consumer: Overdrafts
Risk category of rated loans
Loans	795,000	685,000
Consumer: Purchased Whole Loans
Risk category of rated loans
Loans	6,895,000	5,892,000
Other consumer
Risk category of rated loans
Loans	59,463,000	12,579,000
Pass
Risk category of rated loans
Loans	2,030,897,000	1,525,771,000
Pass | Commercial Real Estate
Risk category of rated loans
Loans	979,008,000	803,369,000
Pass | Commercial real estate - purchased whole loans
Risk category of rated loans
Loans	36,085,000	35,674,000
Pass | Construction & land development
Risk category of rated loans
Loans	93,397,000	63,750,000
Pass | Commercial & Industrial
Risk category of rated loans
Loans	249,035,000	227,344,000
Pass | Lease Financing Receivables
Risk category of rated loans
Loans	12,186,000	8,905,000
Pass | Warehouse lines of credit
Risk category of rated loans
Loans	661,186,000	386,729,000
Special Mention
Risk category of rated loans
Loans	30,084,000	31,312,000
Loans modified by troubled debt restructurings during the period	176,000	180,000
Special Mention | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	22,952,000	24,301,000
Special Mention | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	398,000	860,000
Special Mention | Commercial Real Estate
Risk category of rated loans
Loans	5,656,000	5,070,000
Special Mention | Construction & land development
Risk category of rated loans
Loans	92,000	96,000
Special Mention | Commercial & Industrial
Risk category of rated loans
Loans	853,000	936,000
Special Mention | Home equity lines of credit
Risk category of rated loans
Loans	109,000	21,000
Special Mention | Other consumer
Risk category of rated loans
Loans	24,000	28,000
Substandard
Risk category of rated loans
Loans	23,792,000	27,833,000
Loans modified by troubled debt restructurings during the period	1,000,000	1,000,000
Substandard | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	14,708,000	14,577,000
Substandard | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	1,104,000	1,557,000
Substandard | Commercial Real Estate
Risk category of rated loans
Loans	4,816,000	6,530,000
Substandard | Construction & land development
Risk category of rated loans
Loans	800,000	2,621,000
Substandard | Commercial & Industrial
Risk category of rated loans
Loans	176,000	194,000
Substandard | Home equity lines of credit
Risk category of rated loans
Loans	1,941,000	2,296,000
Substandard | Consumer: Republic Processing Group Loans
Risk category of rated loans
Loans	82,000
Substandard | Consumer: Purchased Whole Loans
Risk category of rated loans
Loans	107,000
Substandard | Other consumer
Risk category of rated loans
Loans	58,000	58,000
Purchased Credit Impaired Loans - Group 1
Risk category of rated loans
Loans	13,899,000	12,543,000
Purchased Credit Impaired Loans - Group 1 | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	2,509,000	560,000
Purchased Credit Impaired Loans - Group 1 | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	793,000	785,000
Purchased Credit Impaired Loans - Group 1 | Commercial Real Estate
Risk category of rated loans
Loans	10,372,000	9,918,000
Purchased Credit Impaired Loans - Group 1 | Construction & land development
Risk category of rated loans
Loans		33,000
Purchased Credit Impaired Loans - Group 1 | Commercial & Industrial
Risk category of rated loans
Loans	30,000	1,247,000
Purchased Credit Impaired Loans - Group 1 | Home equity lines of credit
Risk category of rated loans
Loans	194,000
Purchased Credit Impaired Loans - Group 1 | Other consumer
Risk category of rated loans
Loans	1,000
Rated Loans
Risk category of rated loans
Loans	2,098,672,000	1,597,459,000
Rated Loans | Residential Real Estate - Owner Occupied
Risk category of rated loans
Loans	40,169,000	39,438,000
Rated Loans | Residential Real Estate - Non Owner Occupied
Risk category of rated loans
Loans	2,295,000	3,202,000
Rated Loans | Commercial Real Estate
Risk category of rated loans
Loans	999,852,000	824,887,000
Rated Loans | Commercial real estate - purchased whole loans
Risk category of rated loans
Loans	36,085,000	35,674,000
Rated Loans | Construction & land development
Risk category of rated loans
Loans	94,289,000	66,500,000
Rated Loans | Commercial & Industrial
Risk category of rated loans
Loans	250,094,000	229,721,000
Rated Loans | Lease Financing Receivables
Risk category of rated loans
Loans	12,186,000	8,905,000
Rated Loans | Warehouse lines of credit
Risk category of rated loans
Loans	661,186,000	386,729,000
Rated Loans | Home equity lines of credit
Risk category of rated loans
Loans	2,244,000	2,317,000
Rated Loans | Consumer: Republic Processing Group Loans
Risk category of rated loans
Loans	82,000
Rated Loans | Consumer: Purchased Whole Loans
Risk category of rated loans
Loans	107,000
Rated Loans | Other consumer
Risk category of rated loans
Loans	$ 83,000	$ 86,000