Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest Income
Loans	$ 176,654	$ 178,883	$ 177,240
Investment securities and other	6,407	6,292	7,111
Interest and Dividend Income, Operating	183,061	185,175	184,351
Net Interest Income	155,156	163,056	168,354
Provision for loan losses	9,100	9,281	5,519
Net Interest Income (Loss) After Provision for Loan Losses	146,056	153,775	162,835
Interest Expense
Deposits	20,595	17,387	13,511
Federal Home Loan Bank advances	1,516	1,214	1,707
Short-term borrowings and repurchase agreements	747	1,137	65
Subordinated debentures issued to capital trust	949	803	714
Subordinated notes	4,098	1,578	0
Interest Expense	27,905	22,119	15,997
Noninterest Income
Commissions	1,041	1,097	1,136
Service charges and ATM fees	21,628	21,666	19,841
Net gains on loan sales	3,150	3,941	3,888
Net realized gains on sales of available-for-sale securities	0	2,873	2
Late charges and fees on loans	2,231	1,747	2,129
Gain (loss) on derivative interest rate products	28	66	(43)
Gain (loss) on termination of loss sharing agreements	7,705	(584)	0
Amortization of income/expense related to business acquisitions	(486)	(6,351)	(18,345)
Other income	3,230	4,055	4,973
Noninterest Income	38,527	28,510	13,581
Noninterest Expense
Salaries and employee benefits	60,034	60,377	58,682
Net occupancy expense	24,613	26,077	25,985
Postage	3,461	3,791	3,787
Insurance	2,959	3,482	3,566
Advertising	2,311	2,228	2,317
Office supplies and printing	1,446	1,708	1,333
Telephone	3,188	3,483	3,235
Legal, audit and other professional fees	2,862	3,191	2,713
Expense on Other Real Estate Owned	3,929	4,111	2,526
Partnership Tax Credit Investment Amortization	930	1,681	1,680
Acquired Deposit Intangible Asset Amortization	1,650	1,910	1,750
Other operating expenses	6,878	8,388	6,776
Noninterest Expense	114,261	120,427	114,350
Income Before Income Taxes	70,322	61,858	62,066
Provision for Income Taxes	18,758	16,516	15,564
Net income (loss)	51,564	45,342	46,502
Preferred Stock Dividends	0	0	554
Net Income Available to Common Shareholders	$ 51,564	$ 45,342	$ 45,948
Earnings Per Common Share
Basic	$ 3.67	$ 3.26	$ 3.33
Diluted	$ 3.64	$ 3.21	$ 3.28