Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Condensed Consolidated Statements of Cash Flows (unaudited) [Abstract]
Net Income	$ 29,903	$ 18,764
Adjustments to Reconcile Net Income to Net Cash From Operating Activities
Proceeds from sales of loans held for sale	351,486	313,559
Disbursements for loans held for sale	(343,462)	(316,338)
Provision for loan losses	912	806
Deferred income tax expense	6,972	7,422
Deferred loan fees and costs	(3,681)	(4,588)
Net depreciation, amortization of intangible assets and premiums and accretion of discounts on securities, loans and interest bearing deposits - time	4,560	5,079
Net gains on mortgage loans	(8,571)	(8,886)
Net losses on securities	71	(62)
Share based compensation	1,293	1,342
Increase in accrued income and other assets	(16,925)	(12,748)
Increase (decrease) in accrued expenses and other liabilities	(1,930)	2,274
Total Adjustments	(9,275)	(12,140)
Net Cash From Operating Activities	20,628	6,624
Cash Flow Used in Investing Activities
Proceeds from the sale of securities available for sale	31,445	8,834
Proceeds from maturities, prepayments and calls of securities available for sale	125,275	143,953
Purchases of securities available for sale	(71,067)	(84,080)
Proceeds from the sale of interest bearing deposits - time	2,474	0
Proceeds from the maturity of interest bearing deposits - time	3,728	2,100
Purchase of Federal Reserve Bank stock	(2,034)	0
Net increase in portfolio loans (loans originated, net of principal payments)	(272,084)	(326,089)
Proceeds from the sale of portfolio loans	27,577	0
Acquisition of TCSB Bancorp Inc., less cash received	23,516	0
Cash received from the sale of Mepco Finance Corporation assets, net	0	33,446
Proceeds from bank-owned life insurance	474	523
Proceeds from the sale of other real estate and repossessed assets	1,777	4,111
Capital expenditures	(2,812)	(2,592)
Net Cash Used in Investing Activities	(131,731)	(219,794)
Cash Flow From Financing Activities
Net increase in total deposits	110,400	118,042
Net increase in other borrowings	18,903	3,003
Proceeds from Federal Home Loan Bank advances	1,202,000	461,000
Payments of Federal Home Loan Bank Advances	(1,210,197)	(397,587)
Dividends paid	(10,446)	(6,400)
Proceeds from issuance of common stock	202	57
Share based compensation withholding obligation	(1,327)	(536)
Net Cash From Financing Activities	109,535	177,579
Net Decrease in Cash and Cash Equivalents	(1,568)	(35,591)
Cash and Cash Equivalents at Beginning of Period	54,738	83,194
Cash and Cash Equivalents at End of Period	53,170	47,603
Cash paid during the period for
Interest	11,168	6,240
Income taxes	120	988
Transfers to other real estate and repossessed assets	960	1,389
Transfer of loans to held for sale	27,577	0
Purchase of securities available for sale not yet settled	1,000	1,765
Sale of securities available for sale not yet settled	$ 0	$ 760