Impaired Loans and Allowance for Loan Losses - Activity in Allowance for Loan Losses (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan Losses:
Beginning Balance	$ 20,068	$ 22,104	$ 25,565
Provision for Loan Losses	(3,550)	3,188	10,796
Charge-Offs	(2,755)	(6,784)	(18,288)
Recoveries	3,244	1,560	4,031
Net Charge-Offs/Recoveries	489	(5,224)	(14,257)
Ending Balance	17,071	20,068	22,104
Construction and Land Development [Member]
Allowance for Loan Losses:
Beginning Balance	808	1,134	1,883
Provision for Loan Losses	139	66	(478)
Charge-Offs	(640)	(604)	(612)
Recoveries	415	212	341
Net Charge-Offs/Recoveries	(225)	(392)	(271)
Ending Balance	722	808	1,134
Commercial Real Estate [Member]
Allowance for Loan Losses:
Beginning Balance	6,160	8,849	11,477
Provision for Loan Losses	(2,917)	(522)	3,209
Charge-Offs	(398)	(2,714)	(8,539)
Recoveries	1,683	547	2,702
Net Charge-Offs/Recoveries	1,285	(2,167)	(5,837)
Ending Balance	4,528	6,160	8,849
Residential Real Estate [Member]
Allowance for Loan Losses:
Beginning Balance	11,659	11,090	10,966
Provision for Loan Losses	(1,651)	3,273	7,767
Charge-Offs	(1,126)	(3,153)	(8,381)
Recoveries	902	449	738
Net Charge-Offs/Recoveries	(224)	(2,704)	(7,643)
Ending Balance	9,784	11,659	11,090
Commercial And Financial [Member]
Allowance for Loan Losses:
Beginning Balance	710	468	402
Provision for Loan Losses	697	(24)	283
Charge-Offs	(398)	(60)	(346)
Recoveries	170	326	129
Net Charge-Offs/Recoveries	(228)	266	(217)
Ending Balance	1,179	710	468
Consumer [Member]
Allowance for Loan Losses:
Beginning Balance	731	563	837
Provision for Loan Losses	182	395	15
Charge-Offs	(193)	(253)	(410)
Recoveries	74	26	121
Net Charge-Offs/Recoveries	(119)	(227)	(289)
Ending Balance	$ 794	$ 731	$ 563

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount, after recoveries, of loans and leases that have been written-off.

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Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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