Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Operating activities:
Net income		$ 15,641	$ 13,404
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses		600	735
Depreciation, amortization and accretion, net		783	1,326
Deferred income tax (benefit) expense		(1,028)	488
Gain on sales of mortgage loans held for sale		(238)	(314)
Origination of mortgage loans held for sale		(13,346)	(18,245)
Proceeds from sale of mortgage loans held for sale		12,278	17,284
Bank owned life insurance income	[1]	(178)	(187)
Loss (gain) on the disposal of premises and equipment		4	(6)
Gain on the sale of other real estate		(22)	(109)
Operating lease payments		(354)
Stock compensation expense		863	823
Excess tax benefits from share-based compensation arrangements		(311)	(316)
Net change in accrued interest receivable and other assets		(1,237)	112
Net change in accrued interest payable and other liabilities		(2,400)	(3,716)
Net cash provided by operating activities		11,055	11,279
Investing activities:
Purchases of securities available for sale		(174,490)	(199,946)
Proceeds from maturities and paydowns of securities available for sale		108,124	171,308
Purchases of Federal Home Loan Bank stock			(1,230)
Proceeds from sales of Federal Home Loan Bank stock		590
Net change in loans		17,800	(104,505)
Purchases of premises and equipment		(1,999)	(1,111)
Proceeds from disposal of premises and equipment		40	215
Proceeds from mortality benefit of bank owned life insurance		908
Other investment activities		(824)	(349)
Proceeds from sale of other real estate		512	2,658
Net cash used in investing activities		(49,339)	(132,960)
Financing activities:
Net decrease in deposits		(41,816)	(4,931)
Net increase in securities sold under agreements to repurchase and federal funds purchased		510	51,300
Proceeds from Federal Home Loan Bank advances		30,000	30,000
Repayments of Federal Home Loan Bank advances		(30,324)	(30,318)
Issuance of common stock for stock appreciation rights and performance stock units		(210)	(156)
Common stock repurchases of restricted shares surrendered for taxes		(1,743)	(1,379)
Cash dividends paid		(5,732)	(5,207)
Net cash provided by (used in) financing activities		(49,315)	39,309
Net change in cash and cash equivalents		(87,599)	(82,372)
Cash and cash equivalents at beginning of period		198,939	139,248
Cash and cash equivalents at end of period		111,340	56,876
Supplemental cash flow information:
Income tax payments
Cash paid for interest		5,425	2,383
Supplemental non-cash activity:
Initial recognition of right-of-use lease assets		16,747
Initial recognition of operating lease liabilities		18,067
Transfers from loans to other real estate owned			$ 270

[1] Outside of scope of ASC 606