Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Cash Flows From Operating Activities
Net income	$ 22,730	$ 11,154	$ 43,403	$ 18,709
Reconciliation of net income to net cash provided (used) by operating activities:
Provision (reversal) for loan losses	(710)		(4,369)	723	$ 723
Net security premium amortization			1,476	1,470
Loan discount accretion			(4,407)	(3,328)
Purchase accounting accretion and amortization, net			(125)	(122)
Foreclosed property (gains) losses and write-downs, net			387	223
Loss (gain) on securities available for sale				235
Other losses (gains)			(912)	(731)
Decrease (increase) in net deferred loan fees			(955)	759
Depreciation of premises and equipment			2,859	2,708
Stock-based compensation expense			827	683
Amortization of intangible assets	1,745	1,031	3,417	1,607
Fees/gains from sale of presold mortgages and SBA loans			(8,055)	(3,828)
Origination of presold mortgages in process of settlement			(70,056)	(109,454)
Proceeds from sales of presold mortgages in process of settlement			74,729	107,986
Origination of SBA loans for sale			(110,116)	(27,432)
Proceeds from sales of SBA loans			88,811	22,260
(Increase) decrease in accrued interest receivable			164	(27)
(Increase) decrease in other assets			(14,988)	2,810
Increase in accrued interest payable			416	211
Decrease in other liabilities			(7,504)	(11,886)
Net cash provided (used) by operating activities			(4,998)	3,576
Cash Flows From Investing Activities
Purchases of securities available for sale			(18,850)	(29,809)
Purchases of securities held to maturity				(291)
Proceeds from maturities/issuer calls of securities available for sale			17,835	15,497
Proceeds from maturities/issuer calls of securities held to maturity			9,679	13,683
Proceeds from sales of securities available for sale				45,601
Purchases of Federal Reserve and Federal Home Loan Bank stock, net			(6,099)	(6,527)
Net increase in loans			(73,471)	(162,197)
Proceeds from sales of foreclosed real estate			4,619	4,610
Purchases of premises and equipment			(1,959)	(2,135)
Proceeds from sales of premises and equipment			2,579
Net cash received in acquisition				56,185
Net cash used by investing activities			(65,667)	(65,383)
Cash Flows From Financing Activities
Net increase in deposits			146,882	111,756
Net increase (decrease) in borrowings			(558)	64,973
Cash dividends paid - common stock			(5,338)	(3,642)
Proceeds from stock option exercises	216	242	324	287
Net cash provided by financing activities			141,310	173,374
Increase in cash and cash equivalents			70,645	111,567
Cash and cash equivalents, beginning of period			489,490	305,993	305,993
Cash and cash equivalents, end of period	$ 560,135	$ 417,560	560,135	417,560	$ 489,490
Supplemental Disclosures of Cash Flow Information:
Cash paid during the period for: Interest			9,641	4,872
Cash paid during the period for: Income taxes			10,190	8,570
Non-cash transactions:
Unrealized gain (loss) on securities available for sale, net of taxes			(7,128)	2,106
Foreclosed loans transferred to other real estate			$ 1,913	$ 3,415