Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows From Operating Activities:
Net income	$ 33,719	$ 23,860	$ 20,540
Adjustments to reconcile net income to net cash provided by operations:
Provision for loan losses	6,072	6,655	4,149
Depreciation and amortization of premises and equipment, core deposit intangible, and mortgage servicing rights	4,811	5,242	4,484
Amortization and accretion of securities premiums and discounts, deferred loan fees and costs, net yield and credit mark on acquired loans, and unearned income	(537)	(1,202)	(1,328)
Deferred taxes	(1,076)	3,385	1,023
Net realized gains on sales of available-for-sale securities	0	(1,543)	(1,005)
Net realized and unrealized losses (gains) on trading securities	451	(881)	(503)
Proceeds from sale of trading securities	455	1,091	540
Purchase of trading securities	(1,542)	(2,502)	(319)
Gain on sale of branch	0	(536)	0
Gain on sale of loans	(624)	(545)	(818)
Net losses (gains) on dispositions of premises and equipment and foreclosed assets	47	(107)	134
Proceeds from sale of loans	23,311	24,285	33,045
Origination of loans held for sale	(22,990)	(25,231)	(31,255)
Income on bank owned life insurance, including death benefit of proceeds in excess of cash surrender value	(1,408)	(1,659)	(1,082)
Stock-based compensation expense	1,545	928	820
Contribution of treasury stock	0	0	150
Changes in:
Accrued interest receivable and other assets	(3,079)	(1,175)	(3,906)
Accrued interest payable and other liabilities	4,613	698	2,095
Net Cash Provided By Operating Activities	43,768	30,763	26,764
Cash Flows from Investing Activities:
Proceeds from maturities, prepayments and calls of available-for-sale securities	76,349	92,302	63,837
Proceeds from sales of available-for-sale securities	0	16,340	4,420
Purchase of available-for-sale securities	(189,374)	(23,689)	(21,513)
Loan origination and payments, net	(333,552)	(273,972)	(182,566)
Purchase of bank owned life insurance	0	(10,000)	0
Proceeds from death benefit of BOLI policies	0	897	0
Net cash received from sale of branch	0	1,079	0
Net cash paid for Lake National Bank acquisition	0	0	(2,866)
Purchase of FHLB and other equity interests	(2,991)	(2,331)	(2,628)
Purchase of premises and equipment	(3,068)	(5,215)	(10,125)
Proceeds from the sale of premises and equipment and foreclosed assets	1,048	938	558
Net Cash Used In Investing Activities	(451,588)	(203,651)	(150,883)
Net change in:
Checking, money market and savings accounts	412,505	16,096	79,745
Certificates of deposit	30,466	134,197	(10,603)
Deposits held for sale	0	1,079	0
Purchase of treasury stock	(2,454)	(1,877)	(44)
Proceeds from stock offering, net of issuance costs	0	19,294	0
Cash dividends paid	(10,237)	(10,094)	(9,546)
Proceeds from long-term borrowings	50,000	160,000	80,000
Repayments on long-term borrowings	(27,826)	(70,092)	(81,317)
Net change in short-term borrowings	(34,416)	(69,553)	17,806
Proceeds from subordinated debentures	0	0	50,000
Net Cash Provided By Financing Activities	418,038	179,050	126,041
Net Increase in Cash and Cash Equivalents	10,218	6,162	1,922
Cash and Cash Equivalents, Beginning	35,345	29,183	27,261
Cash and Cash Equivalents, Ending	45,563	35,345	29,183
Cash paid during the period for:
Interest	26,551	17,481	13,284
Income taxes	7,050	7,810	3,966
Supplemental Noncash Disclosures:
Transfers to other real estate owned	228	630	120
Grant of restricted stock awards from treasury stock	996	984	896
Net liabilities assumed from Lake National Bank, excluding cash and cash equivalents	0	0	8,670
Net loans transferred to held for sale	0	0	7,319
Net deposits transferred to held for sale	$ 0	$ 0	$ 6,456