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	$ 20,540	$ 22,197	$ 23,074
Adjustments to reconcile net income to net cash provided by operations:
Provision for loan losses	4,149	2,560	3,840
Depreciation and amortization of premises and equipment, core deposit intangible, and mortgage servicing rights	4,484	4,039	4,127
Amortization and accretion of securities premiums and discounts, deferred loan fees and costs, net yield and credit mark on acquired loans, and unearned income	(1,328)	993	(115)
Deferred taxes	1,023	376	733
Net realized gains on sales of available-for-sale securities	(1,005)	(666)	(429)
Net realized and unrealized losses (gains) on trading securities	(503)	213	(121)
Proceeds from sale of trading securities	540	2,129	248
Purchase of trading securities	(319)	(2,413)	(1,117)
Gain on sale of loans	(818)	(630)	(596)
Net losses on dispositions of premises and equipment and foreclosed assets	134	7	32
Proceeds from sale of loans	33,045	14,927	10,227
Origination of loans held for sale	(31,255)	(15,171)	(10,271)
Income on bank owned life insurance	(1,082)	(1,194)	(1,041)
Stock-based compensation expense	820	621	548
Contribution of treasury stock	150	120	120
Changes in:
Accrued interest receivable and other assets	(3,906)	93	6,266
Accrued interest payable and other liabilities	2,095	5,435	(6,605)
Net Cash Provided By Operating Activities	26,764	33,636	28,920
Cash Flows from Investing Activities:
Net decrease in interest bearing time deposits with other banks	0	225	50
Proceeds from maturities, prepayments and calls of available-for-sale securities	63,837	78,707	81,395
Proceeds from sales of available-for-sale securities	4,420	105,066	61,236
Purchase of available-for-sale securities	(21,513)	(45,120)	(128,591)
Loan origination and payments, net	(182,566)	(224,470)	(59,961)
Purchase of bank owned life insurance	0	0	(5,000)
Net cash paid for Lake National Bank acquisition	(2,866)	0	0
(Purchase) redemption of FHLB and other equity interests	(2,628)	(9,226)	838
Purchase of premises and equipment	(10,125)	(6,751)	(6,426)
Proceeds from the sale of premises and equipment and foreclosed assets	558	855	933
Net Cash Used In Investing Activities	(150,883)	(100,714)	(55,526)
Net change in:
Checking, money market and savings accounts	79,745	(39,285)	100,620
Certificates of deposit	(10,603)	7,259	(88,855)
Purchase of treasury stock	(44)	(868)	(1,675)
Proceeds from sale of treasury stock	0	0	38
Proceeds from exercise of stock options	0	0	549
Cash dividends paid	(9,546)	(9,515)	(9,521)
Proceeds from long-term borrowings	80,000	50,000	950
Repayments on long-term borrowings	(81,317)	(21,472)	(235)
Net change in short-term borrowings	17,806	80,292	23,030
Proceeds from subordinated debentures	50,000	0	0
Net Cash Provided By Financing Activities	126,041	66,411	24,901
Net Decrease in Cash and Cash Equivalents	1,922	(667)	(1,705)
Cash and Cash Equivalents, Beginning	27,261	27,928	29,633
Cash and Cash Equivalents, Ending	29,183	27,261	27,928
Cash paid during the period for:
Interest	13,284	12,502	12,343
Income taxes	3,966	5,431	6,411
Supplemental Noncash Disclosures:
Transfers to other real estate owned	120	806	678
Grant of restricted stock awards from treasury stock	896	803	609
Net liabilities assumed from Lake National Bank, excluding cash and cash equivalents	8,670	0	0
Net loans transferred to held for sale	7,319	0	0
Net deposits transferred to held for sale	$ 6,456	$ 0	$ 0