Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Cash Flows [Abstract]
Net cash provided by operating activities	$ 45,730	$ 42,195
Available-for-sale investment securities:
Purchases	(140,791)	(95,481)
Proceeds from sales	7,381	30,622
Proceeds from principal payments, calls and prepayments	111,315	93,172
Held-to-maturity investment securities:
Purchases	1,310	0
Proceeds from principal payments	1,997	1,747
Net increase in loans	(99,829)	(94,149)
Net expenditures for bank premises and equipment	(3,016)	(4,893)
Proceeds from sales of other real estate owned	494	148
Bank owned life insurance	0	(35,000)
Business acquisitions, net of cash received	(450)	(244)
Return of (investment in) limited partnership and tax credit funds	(6)	2,954
Net cash used in investing activities	(124,203)	(107,032)
Financing activities:
Net (decrease) increase in non-interest-bearing deposits	(9,575)	27,529
Net increase in interest-bearing deposits	164,513	12,040
Net (decrease) increase in short-term borrowings	(111,890)	2,421
Proceeds from long-term borrowings	54,403	55,000
Payments on long-term borrowings	(3,823)	(21,899)
Cash dividends paid	(10,855)	(8,215)
Repurchase of treasury stock under share repurchase program	0	(4,965)
Repurchase of treasury stock in connection with employee incentive plan and compensation plan for Boards of Directors to be held as treasury stock	411	369
Proceeds from issuance of common shares	8	15
Net cash provided by financing activities	82,370	61,557
Net increase (decrease) in cash and cash equivalents	3,897	(3,280)
Cash and cash equivalents at beginning of period	66,146	71,115
Cash and cash equivalents at end of period	$ 70,043	$ 67,835