Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 20,409	$ 15,500
Adjustments to reconcile net income to net cash provided by operations:
PROVISION FOR LOAN LOSSES	3,550	2,038
Depreciation and amortization of premises and equipment, core deposit intangible, and mortgage servicing rights	3,974	3,246
Amortization and accretion of securities premiums and discounts, deferred loan fees and costs, net yield and credit mark on acquired loans, and unearned income	(980)	(1,051)
Net realized gains on sales of available-for-sale securities	(1,543)	(1,005)
Net realized and unrealized gains on trading securities	(475)	(265)
Proceeds from sale of trading securities	402	468
Purchase of trading securities	(1,050)	(271)
Gain on sale of branch	(536)	0
Gain on sale of loans	(253)	(516)
Net (gains) losses on dispositions of premises and equipment and foreclosed assets	(64)	117
Proceeds from sale of loans	17,978	22,329
Origination of loans held for sale	(20,001)	(23,335)
Income on bank owned life insurance, including death benefit proceeds in excess of cash surrender value	(1,308)	(807)
Stock-based compensation expense	600	628
Contribution of treasury stock	0	106
Changes in:
Accrued interest receivable and other assets	2,829	(31,192)
Accrued interest payable and other liabilities	(3,604)	(7,085)
NET CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	19,928	(21,095)
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from maturities, prepayments and calls of available-for-sale securities	59,347	44,360
Proceeds from sales of available-for-sale securities	15,374	4,420
Purchase of available-for-sale securities	(3,620)	(2,221)
Purchase of bank owned life insurance	(10,000)	0
Proceeds from death benefit of bank owned life insurance policies	893	0
Net cash received from sale of branch	1,079	0
Net cash paid for Lake National Bank acquisition	0	(2,866)
Loan origination and payments, net	(226,078)	(102,014)
Purchase of FHLB and other equity interests	(6,959)	(1,776)
Purchase of premises and equipment	(3,718)	(6,082)
Proceeds from the sale of premises and equipment and foreclosed assets	563	466
NET CASH USED IN BY INVESTING ACTIVITIES	(173,119)	(65,713)
Net change in:
Checking, money market and savings accounts	35,303	70,678
Certificates of deposit	8,864	(1,733)
Purchase of treasury stock	(1,360)	(23)
Cash dividends paid	(7,572)	(7,158)
Proceeds from stock offering, net of issuance costs	19,294	0
Repayment of long-term borrowings	(42,505)	(55,041)
Advances from long-term borrowings	140,000	80,000
Proceeds from issuance of subordinated debentures	0	50,000
Net change in short-term borrowings	7,659	(40,272)
NET CASH PROVIDED BY FINANCING ACTIVITIES	159,683	96,451
NET INCREASE IN CASH AND CASH EQUIVALENTS	6,492	9,643
CASH AND CASH EQUIVALENTS, Beginning	29,183	27,261
CASH AND CASH EQUIVALENTS, Ending	35,675	36,904
Cash paid during the period for:
Interest	12,699	9,506
Income taxes	6,000	3,966
SUPPLEMENTAL NONCASH DISCLOSURES:
Transfers to other real estate owned	239	49
Grant of restricted stock awards from treasury stock	943	875
Net assets acquired excluding cash and cash equivalents	543	0
Lake National Bank [Member]
SUPPLEMENTAL NONCASH DISCLOSURES:
Net assets acquired excluding cash and cash equivalents	$ 0	$ 2,866