Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Condensed Consolidated Statements of Cash Flows (unaudited) [Abstract]
Net income	$ 10,538	$ 9,400
Adjustments to Reconcile Net Income to Net Cash From Operating Activities
Proceeds from sales of loans held for sale	129,838	154,938
Disbursements for loans held for sale	(129,514)	(157,871)
Provision for loan losses	(1,264)	(793)
Deferred federal income tax expense	5,625	4,475
Deferred loan fees	(987)	(930)
Depreciation, amortization of intangible assets and premiums and accretion of discounts on securities, loans and interest bearning deposits - time	2,507	2,228
Net gains on mortgage loans	(4,171)	(3,923)
Net gains on securities	(347)	(52)
Net gains on other real estate and repossessed assets	(165)	(178)
Vehicle service contract counterparty contingencies	29	59
Share based compensation	825	772
(Increase) decrease in accrued income and other assets	(1,051)	551
Increase (decrease) in accrued expenses and other liabilities	2,639	(894)
Total Adjustments	3,964	(1,618)
Net Cash From Operating Activities	14,502	7,782
Cash Flow Used in Investing Activities
Proceeds from the sale of securities available for sale	55,362	11,786
Proceeds from the maturity of securities available for sale	21,413	16,047
Principal payments received on securities available for sale	74,212	58,587
Purchases of securities available for sale	(159,698)	(111,908)
Purchases of interest bearing deposits - time	0	(245)
Proceeds from the maturity of interest bearing deposits - time	3,290	2,915
Purchase of Federal Reserve Bank stock	(129)	(132)
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)	(64,236)	(39,442)
Proceeds from the collection of vehicle service contract counterparty receivables	4,458	15
Proceeds from the sale of other real estate and repossessed assets	3,018	4,515
Proceeds from life insurance	742	0
Proceeds from the sale of property and equipment	23	490
Capital expenditures	(990)	(1,898)
Net Cash Used in Investing Activities	(62,164)	(54,365)
Cash Flow From Financing Activities
Net increase in total deposits	42,329	37,115
Net decrease in other borrowings	(1)	(1)
Payments of Federal Home Loan Bank advances	(156)	(144)
Net increase in vehicle service contract counterparty payables	269	328
Dividends paid	(3,451)	(2,760)
Proceeds from issuance of common stock	56	80
Repurchase of common stock	(15,510)	(3,668)
Share based compensation withholding obligation	(627)	(66)
Net Cash From Financing Activities	22,909	30,884
Net Decrease in Cash and Cash Equivalents	(24,753)	(15,699)
Cash and Cash Equivalents at Beginning of Period	85,783	74,016
Cash and Cash Equivalents at End of Period	61,030	58,317
Cash paid during the period for
Interest	3,158	2,878
Income taxes	360	91
Transfers to other real estate and repossessed assets	1,275	2,354
Transfer of payment plan receivables to vehicle service contract counterparty receivables	294	110
Purchase of securities available for sale not yet settled	$ 2,342	$ 0