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:
Interest and fees on loans	$ 107,842	$ 102,481	$ 102,656
Interest on securities: Taxable	10,437	11,008	15,359
Interest on securities: Nontaxable	2,149	2,553	2,699
Dividends on corporate stock and Federal Home Loan Bank stock	561	148	256
Other interest income	128	158	91
Total interest and dividend income	121,117	116,348	121,061
Interest expense:
Deposits	12,937	12,420	13,590
Federal Home Loan Bank advances	7,698	10,643	14,957
Junior subordinated debentures	964	1,484	1,570
Other interest expense	13	16	248
Total interest expense	21,612	24,563	30,365
Net interest income	99,505	91,785	90,696
Provision for loan losses	1,850	2,400	2,700
Net interest income after provision for loan losses	97,655	89,385	87,996
Noninterest income:
Wealth management revenues	33,378	31,825	29,641
Merchant processing fees	1,291	10,220	10,159
Net gains on loan sales and commissions on loans originated for others	6,802	13,085	14,092
Service charges on deposit accounts	3,395	3,256	3,193
Card interchange fees	3,057	2,788	2,480
Income from bank-owned life insurance	1,846	1,850	2,448
Net realized gains on securities	0	0	1,223
Net gains on interest rate swap contracts	1,136	951	255
Equity in earnings (losses) of unconsolidated subsidiaries	(276)	(107)	196
Net gain on sale of business line	6,265	0	0
Other income	2,121	1,701	1,748
Noninterest income, excluding other-than-temporary impairment losses	59,015	65,569	65,435
Total other-than-temporary impairment losses on securities	0	(294)	(28)
Portion of loss recognized in other comprehensive income (before tax)	0	(3,195)	(193)
Net impairment losses recognized in earnings	0	(3,489)	(221)
Total noninterest income	59,015	62,080	65,214
Noninterest expense:
Salaries and employee benefits	58,530	60,052	59,786
Net occupancy	6,312	5,769	6,039
Equipment	4,903	4,847	4,640
Merchant processing costs	1,050	8,682	8,593
Outsourced services	4,483	3,662	3,560
Legal, audit and professional fees	2,336	2,330	2,240
FDIC deposit insurance costs	1,762	1,761	1,730
Advertising and promotion	1,546	1,464	1,730
Amortization of intangibles	644	680	728
Foreclosed property costs	43	258	762
Debt prepayment penalties	6,294	1,125	3,908
Other expenses	8,944	8,155	8,622
Total noninterest expense	96,847	98,785	102,338
Income before income taxes	59,823	52,680	50,872
Income tax expense	18,999	16,527	15,798
Net income	$ 40,824	$ 36,153	$ 35,074
Weighted average common shares outstanding - basic	16,689	16,506	16,358
Weighted average common shares outstanding - diluted	16,872	16,664	16,401
Per share information:
Basic earnings per common share (in dollars per share)	$ 2.44	$ 2.18	$ 2.13
Diluted earnings per common share (in dollars per share)	$ 2.41	$ 2.16	$ 2.13
Cash dividends declared per share (in dollars per share)	$ 1.22	$ 1.03	$ 0.94