CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES:
Net income	$ 45,903	$ 35,166	$ 28,787
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization on investment securities, net	503	729	424
Accretion on loans deposits and core deposit intangible net	(2,573)	(2,835)	(6,263)
Depreciation of premises and equipment	7,495	6,742	6,363
Amortization of mortgaging servicing rights	1,757	1,400	1,330
Provision for loan and lease losses	14,493	5,396	2,859
Net gain on sale of mortgage loans held for sale	(6,656)	(3,915)	(2,440)
Origination of mortgage loans held for sale	(216,812)	(160,989)	(82,457)
Proceeds from sale of mortgage loans held for sale	214,760	167,209	82,015
Net gain on sale of consumer loans held for sale	(2,835)	(978)
Origination of consumer loans held for sale	(380,066)	(137,551)
Proceeds from sale of consumer loans held for sale	379,907	138,015
Net realized gain on sales, calls and impairment of securities		(88)
Net gain realized on sale of other real estate owned	(514)	(956)	(883)
Writedowns of other real estate owned	270	1,257	3,101
Net gain on sale of banking center		(28)
Deferred director compensation expense - Company Stock	170	223	187
Stock based compensation expense	1,030	422	458
Increase in cash surrender value of bank owned life insurance	(1,516)	(1,402)	(1,329)
Net change in other assets and liabilities:
Accrued interest receivable	(659)	(426)	(535)
Accrued interest payable	(298)	(33)	(197)
Other assets	(7,227)	(2,785)	(2,145)
Other liabilities	540	5,473	(2,570)
Net cash provided by operating activities	47,672	50,046	26,705
INVESTING ACTIVITIES:
Net change in cash for acquisition of Cornerstone Bancorp, Inc.	(9,088)
Purchases of securities available for sale	(419,254)	(1,512,809)	(876,854)
Purchases of securities to be held to maturity	(19,935)
Proceeds from calls, maturities and paydowns of securities available for sale	452,247	1,427,696	875,978
Proceeds from calls, maturities and paydowns of securities held to maturity	6,112	6,663	5,137
Net change in outstanding warehouse lines of credit	(198,710)	(67,298)	(169,855)
Purchase of non-business acquisition loans, including premiums paid	(51,868)	(117,516)	(235,824)
Net change in other loans	(125,756)	(100,660)	(46,383)
Proceeds from redemption of Federal Home Loan Bank stock	224		134
Proceeds from sale of mortgage loans transferred to held for sale	72,330
Proceeds from sales of other real estate owned	4,595	9,412	9,532
Proceeds from sale of banking center		1,623
Net purchases of premises and equipment	(7,031)	(5,319)	(7,759)
Purchase of bank owned life insurance			(25,000)
Net cash used in investing activities	(296,134)	(358,208)	(470,894)
FINANCING ACTIVITIES:
Net change in deposits	468,544	429,295	67,325
Net change in securities sold under agreements to repurchase and other short-term borrowings	(221,960)	39,325	190,553
Payments of Federal Home Loan Bank advances	(292,000)	(218,000)	(188,000)
Proceeds from Federal Home Loan Bank advances	395,000	210,000	290,500
Payoff of subordinated note, net of common security interest	(4,000)
Repurchase of Common Stock	(1,207)	(551)	(347)
Net proceeds from Common Stock options exercised	80	1,136	1,103
Cash dividends paid	(16,768)	(15,839)	(14,930)
Net cash provided by (used in) financing activities	327,689	445,366	346,204
NET CHANGE IN CASH AND CASH EQUIVALENTS	79,227	137,204	(97,985)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	210,082	72,878	170,863
CASH AND CASH EQUIVALENTS AT END OF YEAR	289,309	210,082	72,878
Cash paid during the period for:
Interest	18,219	18,495	19,801
Income taxes	26,069	17,942	18,828
SUPPLEMENTAL NONCASH DISCLOSURES:
Transfers from loans to real estate acquired in settlement of loans	4,778	2,938	7,333
Transfers from loans held for investment to held for sale	71,201
Loans provided for sales of other real estate owned	$ 256	$ 3,248	$ 1,442