Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Income
Loans	$ 68,682	$ 68,077	$ 72,621
Investment securities:
Taxable	3,507	2,695	4,241
Tax-exempt	3,068	2,901	2,882
Interest-bearing deposits	349	282	300
FHLB stock dividends	642	826	899
Total interest income	76,248	74,781	80,943
Interest Expense
Deposits	5,283	5,913	8,169
Federal Home Loan Bank advances and other	528	434	2,424
Subordinated debentures	587	601	971
Securities sold under agreement to repurchase	161	222	373
Total interest expense	6,559	7,170	11,937
Net interest income	69,689	67,611	69,006
Provision for loan losses	1,117	1,824	10,924
Net interest income after provision for loan losses	68,572	65,787	58,082
Noninterest Income
Service fees and other charges	10,258	10,045	10,779
Mortgage banking income	5,602	8,443	9,665
Insurance commissions	9,859	9,627	8,676
Gain on sale of non-mortgage loans	181	101	70
Gain (loss) on sale or call of securities	932	97	2,139
Other-than-temporary impairment (OTTI) losses on investment securities
Total gains (impairment losses) on investment securities	0	(337)	(31)
Losses recognized in other comprehensive income	0	0	26
Net impairment loss recognized in earnings	0	(337)	(5)
Trust income	1,240	969	616
Income from bank owned life insurance	1,802	883	924
Other noninterest income	1,767	950	1,510
Total noninterest income	31,641	30,778	34,374
Noninterest Expense
Compensation and benefits	35,543	34,301	32,566
Occupancy	6,683	6,675	7,578
FDIC insurance	1,419	1,616	2,691
Data processing	5,856	5,125	4,660
Other noninterest expense	17,257	17,335	18,285
Total noninterest expense	66,758	65,052	65,780
Income before income taxes	33,455	31,513	26,676
Federal income taxes	9,163	9,278	8,012
Net Income	24,292	22,235	18,664
Dividends Accrued on Preferred Shares	0	0	(900)
Accretion on Preferred Shares	0	0	(359)
Redemption of Preferred Shares	0	0	642
Net Income Applicable to Common Shares	$ 24,292	$ 22,235	$ 18,047
Earnings per common share:
Basic (in dollars per share)	$ 2.55	$ 2.28	$ 1.86
Diluted (in dollars per share)	$ 2.44	$ 2.19	$ 1.81
Dividends declared per common share (in dollars per share)	$ 0.63	$ 0.40	$ 0.20