Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net Income	$ 67,081	$ 57,910	$ 50,539
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	10,388	1,715	8,311
Provision for unfunded loan commitments	258	(655)	(60)
Net depreciation, amortization and accretion	356	4,703	5,333
Net amortization of discounts and premiums on securities	3,600	3,680	3,826
Stock-based compensation expense	1,636	975	687
Securities losses, (gains), net	34	(41)	(5)
Net gain on sale of merchant card servicing business	0	0	(3,093)
Tax benefit from stock-based compensation	(53)	(16)	(96)
Mortgage loans originated for sale	(107,489)	(42,842)	(66,695)
Proceeds from the sale of loans	99,458	42,361	87,932
Deferred income taxes	(427)	1,536	(2,358)
Gain on sale of fixed assets	(179)	(33)	0
Gain on the sale of loans, net	(1,044)	(353)	(874)
Net increase in interest receivable	(2,744)	(933)	(130)
Net decrease in interest payable	(193)	(127)	(2,005)
Net (increase) decrease in other assets	(11,396)	7,628	25,681
Net increase (decrease) in other liabilities	1,298	2,595	(20,917)
Net Cash Provided by Operating Activities	60,584	78,103	86,076
INVESTING ACTIVITIES
Proceeds from maturities, prepayments and calls of securities available-for-sale	50,142	57,092	66,744
Proceeds from sales of securities available-for-sale	11,119	1,418	94
Purchases of securities available-for-sale	(74,712)	(181,213)	(144,752)
Net purchases of Federal Home Loan Bank stock	(855)	(1,506)	1,685
Net increase in loans	(383,575)	(313,264)	(241,172)
Proceeds from the sale of loans not originated for resale	2,880	5,408	5,158
Purchases of premises and equipment	(5,133)	(5,079)	(2,833)
Proceeds from the sale of premises and equipment	467	96	643
Net cash paid in excess of cash acquired from bank merger	(16,347)	0	0
Proceeds from the sale of merchant card servicing business	0	0	4,750
Proceeds from surrender of bank owned life insurance	10,277	0	0
Net Cash Used in Investing Activities	(405,737)	(437,048)	(309,683)
FINANCING ACTIVITIES
Net increase (decrease) in core deposits	195,589	240,948	(22,767)
Net increase (decrease) in certificates of deposit	51,209	(4,549)	56,174
Net (decrease) increase in short-term borrowings	(2,660)	150,000	65,000
Net increase (decrease) in securities sold under repurchase agreements	31,481	(3,242)	(28,735)
Proceeds from long-term borrowings	100,000	0	0
Repayments of long-term borrowings	(2,399)	(2,367)	(12,291)
Repayment of junior subordinated debt	(13,500)	0	(45,000)
Treasury shares issued-net	(182)	(163)	(88)
Common stock Issuance costs	(132)	(271)	0
Cash dividends paid to common shareholders	(24,487)	(20,203)	(18,137)
Tax benefit from stock-based compensation	53	16	96
Net Cash Provided by (Used in) Financing Activities	334,972	360,169	(5,748)
Net (decrease) increase in cash and cash equivalents	(10,181)	1,224	(229,355)
Cash and cash equivalents at beginning of year	109,580	108,356	337,711
Cash and Cash Equivalents at End of Year	99,399	109,580	108,356
Supplemental Disclosures
Transfers to other real estate owned and other repossessed assets	843	586	1,238
Interest paid	15,878	12,609	16,568
Income taxes paid, net of refunds	23,175	18,075	13,130
Loans transferred to held for sale	23,277	0	5,158
Net assets (liabilities) from acquisitions, excluding cash and cash equivalents	$ 43,433	$ 0	$ 0