CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income		$ 18,336	$ 14,514
Adjustments to reconcile net income to net cash from operating activities:
Depreciation		1,404	1,165
Provision for loan losses		3,300	200
Net loss (gain) on sale and write down of other real estate owned		16	(5)
Amortization of loan servicing rights		132	158
Loans originated for sale, including participations		(9,506)	(10,812)
Net gain on sales of loans		(350)	(364)
Proceeds from sale of loans, including participations		11,499	13,066
Net loss on sales of premises and equipment		2	0
Net loss (gain) on sales and calls of securities available for sale	[1]	6	(3)	[2]
Net securities amortization		749	715
Stock based compensation expense		1,411	1,559
Earnings on life insurance		(363)	(471)
Gain on life insurance		(201)	0
Tax benefit of stock option exercises		(761)	(924)
Net change:
Interest receivable and other assets		(2,130)	(301)
Interest payable and other liabilities		2,395	2,263
Total adjustments		7,603	6,246
Net cash from operating activities		25,939	20,760
Cash flows from investing activities:
Proceeds from sale of securities available for sale		12,322	16,811
Proceeds from maturities, calls and principal paydowns of securities available for sale		12,659	14,109
Purchases of securities available for sale		(53,841)	(52,763)
Purchase of life insurance		(258)	(446)
Net increase in total loans		(32,003)	(61,496)
Proceeds from sales of land, premises and equipment		1	0
Purchases of land, premises and equipment		(678)	(2,285)
Proceeds from sales of other real estate		12	42
Proceeds from life insurance		564	0
Net cash from investing activities		(61,222)	(86,028)
Cash flows from financing activities
Net increase in total deposits		90,833	101,485
Net increase in short-term borrowings		24,064	89,731
Payments on long-term borrowings		(80,030)	(175,002)
Common dividends paid		(5,545)	(4,771)
Payments related to equity incentive plans		(2,483)	(1,652)
Purchase of treasury stock		(185)	(220)
Net cash from financing activities		26,654	9,571
Net change in cash and cash equivalents		(8,629)	(55,697)
Cash and cash equivalents at beginning of the period		176,180	167,280
Cash and cash equivalents at end of the period		167,551	111,583
Cash paid during the period for:
Interest		8,672	5,841
Income taxes		0	4
Supplemental non-cash disclosures:
Securities purchases payable		$ 3,081	$ 2,073

[1] Not within scope of ASC 606

[2] The Company elected the modified retrospective approach of adoption; therefore, prior period