Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income	$ 19,505	$ 27,268	$ 22,231
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	4,821	3,802	3,607
Depreciation of premises and equipment	4,089	3,757	3,243
Net gain on sales of investment securities	(518)	(1,265)	(635)
Net gain on mortgage banking activities	(6,027)	(4,838)	(2,182)
Bank owned life insurance income	(2,931)	(1,295)	(1,628)
Net amortization on investment securities	1,853	1,284	1,690
Amortization, fair market value adjustments and capitalization of mortgage servicing rights	(521)	(368)	10
Net accretion of acquisition accounting fair value adjustments	(2,779)	(2,048)	0
Stock-based compensation	2,084	1,421	1,141
Intangible expenses	5,528	2,567	2,167
Other adjustments to reconcile net income to cash provided by operating activities	659	(133)	(822)
Deferred tax expense	942	3,816	4,162
Originations of loans held for sale	(258,202)	(209,464)	(131,461)
Proceeds from the sale of loans held for sale	262,948	212,613	132,278
Contributions to pension and other postretirement benefit plans	(2,261)	(2,271)	(254)
Decrease (increase) in accrued interest receivable and other assets	1,956	3,055	(3,237)
Increase (decrease) in accrued interest payable and other liabilities	2,160	1,442	(587)
Net cash provided by operating activities	33,306	39,343	29,723
Cash flows from investing activities:
Net cash paid due to acquisitions	(94,835)	(2,967)	(9,260)
Net capital expenditures	(12,644)	(5,890)	(5,595)
Proceeds from maturities and calls of securities held-to-maturity	21,000	13,000	11,000
Proceeds from maturities and calls of securities available-for-sale	110,927	79,482	58,744
Proceeds from sales of securities available-for-sale	77,290	77,308	32,967
Purchases of investment securities held-to-maturity	5,071	0	0
Purchases of investment securities available-for-sale	(80,476)	(162,722)	(65,215)
Proceeds from sale of loans transferred to held for sale	0	4,000	0
Proceeds from sale of portfolio loans	2,435	0	0
Proceeds from sale of credit card portfolio	0	0	8,940
Net increase in loans and leases	(337,961)	(181,037)	(100,981)
Net decrease (increase) in interest-earning deposits	35,004	(16,954)	30,070
Net (increase) decrease in other investments	(11,773)	(3,718)	2,144
Proceeds from sales of other real estate owned	885	14	891
Net decrease in federal funds sold	0	17,442	0
Purchases of bank owned life insurance	0	(8,000)	0
Proceeds from bank owned life insurance	662	0	0
Net cash used in investing activities	(294,557)	(190,042)	(36,295)
Cash flows from financing activities:
Net increase in deposits	125,425	147,572	16,843
Net increase (decrease) in short-term borrowings	123,207	(17,763)	4,217
Proceeds from Issuance of Long-term Debt	20,000	0	0
Repayments of Long-term Debt	(15,000)	0	0
Proceeds from issuance of subordinated notes	44,515	49,267	0
Payment of contingent consideration on acquisitions	(2,552)	(2,631)	(310)
Purchases of treasury stock	(8,359)	(13,342)	(4,605)
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	2,472	2,434	2,462
Proceeds from exercise of stock options, including excess tax benefits	4,968	534	310
Cash dividends paid	(17,024)	(15,011)	(12,996)
Net cash provided by financing activities	277,652	151,060	5,921
Net decrease (increase) in cash and due from banks	16,401	361	(651)
Cash and due from banks at beginning of year	32,356	31,995	32,646
Cash and due from banks at end of period	48,757	32,356	31,995
Supplemental disclosures of cash flow information:
Cash paid for interest	13,982	8,099	4,118
Cash paid for income taxes, net of refunds	8,053	2,142	5,899
Non cash transactions:
Transfer of loans to other real estate owned	2,347	320	0
Transfer of loans to loans held for sale	0	4,000	8,926
Assets acquired through acquisitions	1,090,395	425,185	0
Liabilities assumed through acquisitions	911,316	389,795	0
Contingent consideration recorded as goodwill	$ 0	$ 1,525	$ 6,105