Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES
Net Income	$ 71,392	$ 67,081	$ 57,910
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	17,965	10,388	1,715
Provision for unfunded loan commitments	65	258	(655)
Net depreciation, amortization and accretion	3,628	356	4,703
Net amortization of discounts and premiums on securities	3,829	3,600	3,680
Stock-based compensation expense	2,544	1,636	975
Securities losses, (gains), net	0	34	(41)
Net gain on sale of credit card portfolio	(2,066)	0	0
Pension plan curtailment gain	(1,017)	0	0
Tax benefit from stock-based compensation	(9)	(53)	(16)
Mortgage loans originated for sale	(106,020)	(107,489)	(42,842)
Proceeds from the sale of loans	108,209	99,458	42,361
Deferred income taxes	536	(427)	1,536
Gain on sale of fixed assets	0	(179)	(33)
Gain on the sale of loans, net	(1,621)	(1,044)	(353)
Net increase in interest receivable	(2,409)	(2,744)	(933)
Net increase (decrease) in interest payable	1,715	(193)	(127)
Net decrease (increase) in other assets	4,668	(11,396)	7,628
Net (decrease) increase in other liabilities	(4,613)	1,298	2,595
Net Cash Provided by Operating Activities	96,796	60,584	78,103
INVESTING ACTIVITIES
Proceeds from maturities, prepayments and calls of securities available-for-sale	74,110	50,142	57,092
Proceeds from sales of securities available-for-sale	0	11,119	1,418
Purchases of securities available-for-sale	(113,362)	(74,712)	(181,213)
Net purchases of Federal Home Loan Bank stock	(8,784)	(855)	(1,506)
Net increase in loans	(599,341)	(383,575)	(313,264)
Proceeds from the sale of loans not originated for resale	9,208	2,880	5,408
Purchases of premises and equipment	(3,560)	(5,133)	(5,079)
Proceeds from the sale of premises and equipment	57	467	96
Net cash paid in excess of cash acquired from bank merger	0	(16,347)	0
Proceeds from the sale of credit card portfolio	25,019	0	0
Proceeds from surrender of bank owned life insurance	0	10,277	0
Net Cash Used in Investing Activities	(616,653)	(405,737)	(437,048)
FINANCING ACTIVITIES
Net increase in core deposits	378,323	195,589	240,948
Net increase (decrease) in certificates of deposit	18,095	51,209	(4,549)
Net increase (decrease) in short-term borrowings	304,000	(2,660)	150,000
Net (decrease) increase in securities sold under repurchase agreements	(11,254)	31,481	(3,242)
Proceeds from long-term borrowings	0	100,000	0
Repayments of long-term borrowings	(102,330)	(2,399)	(2,367)
Repayment of junior subordinated debt	0	(13,500)	0
Treasury shares issued-net	115	182	163
Common stock Issuance costs	0	(132)	(271)
Cash dividends paid to common shareholders	(26,784)	(24,487)	(20,203)
Tax benefit from stock-based compensation	9	53	16
Net Cash Provided by (Used in) Financing Activities	559,944	334,972	360,169
Net increase (decrease) in cash and cash equivalents	40,087	(10,181)	1,224
Cash and cash equivalents at beginning of year	99,399	109,580	108,356
Cash and Cash Equivalents at End of Year	139,486	99,399	109,580
Supplemental Disclosures
Transfers to other real estate owned and other repossessed assets	1,039	843	586
Interest paid	22,800	15,878	12,609
Income taxes paid, net of refunds	26,743	23,175	18,075
Loans transferred to held for sale	250	23,277	0
Loans transferred to portfolio from held for sale	7,933	0	0
Net assets (liabilities) from acquisitions, excluding cash and cash equivalents	$ 0	$ 43,433	$ 0