Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Condensed Consolidated Statements of Cash Flows (unaudited) [Abstract]
Net income	$ 16,911	$ 14,447
Adjustments to Reconcile Net Income to Net Cash From Operating Activities
Proceeds from sales of loans held for sale	222,610	227,381
Disbursements for loans held for sale	(225,025)	(223,446)
Provision for loan losses	(1,439)	(1,037)
Deferred federal income tax expense	8,726	7,210
Deferred loan fees	(1,634)	(1,189)
Depreciation, amortization of intangible assets and premiums and accretion of discounts on securities, loans and interest bearning deposits - time	3,831	3,345
Net gains on mortgage loans	(7,727)	(5,735)
Net gains on securities	(302)	(97)
Net (gains) losses on other real estate and repossessed assets	98	(173)
Vehicle service contract counterparty contingencies	(10)	89
Share based compensation	1,200	1,153
Gain on branch sale	0	(1,193)
Net gain on sale of fixed assets	(2)	(152)
Increase in accrued income and other assets	(5,540)	(359)
Increase (decrease) in accrued expenses and other liabilities	1,409	(684)
Total Adjustments	(3,805)	5,113
Net Cash From Operating Activities	13,106	19,560
Cash Flow Used in Investing Activities
Proceeds from the sale of securities available for sale	56,451	11,786
Proceeds from the maturity of securities available for sale	32,590	25,458
Principal payments received on securities available for sale	117,513	94,333
Purchases of securities available for sale	(213,839)	(195,623)
Purchases of interest bearing deposits - time	0	(4,100)
Proceeds from the maturity of interest bearing deposits - time	4,613	4,576
Purchase of Federal Reserve Bank stock	(407)	(272)
Redemption of Federal Reserve Bank stock	371	391
Redemption of Federal Home Loan Bank stock	0	4,514
Net increase in portfolio loans (loans originated, net of principal payments)	(73,673)	(56,407)
Purchase of portfolio loans	(15,000)	0
Net cash paid in branch sale	0	(7,229)
Proceeds from the collection of vehicle service contract counterparty receivables	4,671	255
Proceeds from the sale of other real estate and repossessed assets	3,854	5,619
Proceeds from life insurance	2,235	0
Proceeds from the sale of property and equipment	23	490
Capital expenditures	(1,717)	(2,925)
Net Cash Used in Investing Activities	(82,315)	(119,134)
Cash Flow From Financing Activities
Net increase in total deposits	120,997	145,313
Net increase (decrease) in other borrowings	5	(1)
Payments of Federal Home Loan Bank Advances	(432)	(399)
Net decrease in vehicle service contract counterparty payables	(259)	(27)
Dividends paid	(5,149)	(4,118)
Proceeds from issuance of common stock	61	103
Repurchase of common stock	(16,854)	(9,025)
Share based compensation withholding obligation	(627)	(1,091)
Net Cash From Financing Activities	97,742	130,755
Net Increase in Cash and Cash Equivalents	28,533	31,181
Cash and Cash Equivalents at Beginning of Period	85,783	74,016
Cash and Cash Equivalents at End of Period	114,316	105,197
Cash paid during the period for
Interest	4,811	4,302
Income taxes	437	229
Transfers to other real estate and repossessed assets	1,791	2,843
Transfer of payment plan receivables to vehicle service contract counterparty receivables	40	431
Purchase of securities available for sale not yet settled	$ 7,440	$ 7,717