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	$ 41,353		$ 33,433		$ 18,694
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	6,282		7,067		5,132
Provision for loan losses	1,600		2,325		1,800
Provision for deferred taxes	(1,521)		6,962		2,966
Increase in cash surrender value of life insurance	1,857		1,778		1,284
Stock-based compensation expense	4,901		3,064		1,608
Assets (gains) losses, net	(1,169)		(2,029)		(54)
Gain on sale of loans held for sale, net	(5,499)		(4,777)		(5,248)
Proceeds from sale of loans held for sale	241,739		222,879		255,704
Origination of loans held for sale	(234,416)		(219,696)		(252,771)
Net change in accrued interest receivable and other assets	666		5,360		(301)
Net change in accrued interest payable and other liabilities	242		(1,377)		(2,042)
Net cash provided by operating activities	50,989		40,713		24,806
Cash Flows From Investing Activities:
Net decrease in certificates of deposit in other banks	753		2,238		1,432
Purchases of securities AFS	(76,564)		(63,117)		(82,448)
Proceeds from sales of securities AFS	5,280		10,798		31,442
Proceeds from calls and maturities of securities AFS	66,706		47,569		35,641
Net (increase) decrease in loans	(71,629)		(160,624)		2,805
Purchases of other investments	(1,550)		(3,320)		(3,447)
Proceeds from sales of other investments	807		6,678
Net increases in premises and equipment	4,260		2,018		4,048
Proceeds from sales of other real estate and other assets	2,824		1,724		1,999
Purchase of BOLI			0		(20,000)
Proceeds from redemption of BOLI	561		0		21,549
Net cash received in business combinations	0		9,119		66,517
Net cash provided by (used in) investing activities	(77,072)		(150,953)		51,442
Cash Flows From Financing Activities:
Net increase in deposits	143,153		126,782		91,236
Net decrease in short-term borrowings	0		0		(49,087)
Proceeds from long-term borrowings	0		30,000		0
Repayments of long-term borrowings	1,253		9,549		56,519
Distribution to noncontrolling interest	(275)		0		0
Capitalized issuance costs, net	0		(186)		(260)
Purchase and retirement of common stock	(22,749)		(15,007)		(5,201)
Proceeds from issuance of common stock, net	1,800		4,030		1,900
Redemption of preferred stock			0		(12,200)
Cash dividends paid on preferred stock			0		(633)
Net cash provided by (used in) financing activities	120,676		136,070		(30,764)
Net increase in cash and cash equivalents	94,593		25,830		45,484
Cash and cash equivalents:
Beginning cash and cash equivalents	154,933	[1]	129,103	[1]	83,619
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest	18,537		10,932		7,508
Cash paid for taxes	10,821		12,789		7,150
Transfer of loans and bank premises to other real estate owned	607		828		237
Capitalized mortgage servicing rights	1,203		876		1,023
Transfer of loans from held for sale to held for investment	0		3,236		0
Acquisitions:
Fair value of assets acquired	0		439,000		1,039,000
Fair value of liabilities assumed	0		398,000		939,000
Net assets acquired	0		41,000		100,000
Common stock issued in acquisitions	$ 0		$ 62,246		$ 165,295

[1] Cash and cash equivalents include restricted cash of $6.3 million and $5.4 million at December 31, 2018 and 2017, respectively, for the reserve balance required with the Federal Reserve Bank. There was no reserve balance required at December 31, 2016.