Allowance for Loan Losses - Allowance For Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ 18,153	$ 16,723
Charge-Offs	(734)	(188)
Recoveries	61	86
Provision (benefit)	703	326
Balance, end of period	18,183	16,947
Balance, end of period: Individually evaluated for impairment	119	416
Balance, end of period: collectively evaluated for impairment	18,064	16,531
Commercial
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	5,906	5,643
Charge-Offs	(733)	(107)
Recoveries	58	67
Provision (benefit)	518	488
Balance, end of period	5,749	6,091
Balance, end of period: Individually evaluated for impairment	119	361
Balance, end of period: collectively evaluated for impairment	5,630	5,730
Real Estate Construction One-To- Four Family
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	854	644
Charge-Offs	0	0
Recoveries	0	0
Provision (benefit)	(94)	113
Balance, end of period	760	757
Balance, end of period: Individually evaluated for impairment	0	0
Balance, end of period: collectively evaluated for impairment	760	757
Real Estate Construction Other
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	1,439	1,653
Charge-Offs	0	0
Recoveries	0	0
Provision (benefit)	182	10
Balance, end of period	1,621	1,663
Balance, end of period: Individually evaluated for impairment	0	0
Balance, end of period: collectively evaluated for impairment	1,621	1,663
Real Estate Term Owner Occupied
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	1,657	1,580
Charge-Offs	0	0
Recoveries	0	0
Provision (benefit)	82	(10)
Balance, end of period	1,739	1,570
Balance, end of period: Individually evaluated for impairment	0	0
Balance, end of period: collectively evaluated for impairment	1,739	1,570
Real Estate Term Non-Owner Occupied
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	5,515	4,704
Charge-Offs	0	0
Recoveries	0	0
Provision (benefit)	(17)	90
Balance, end of period	5,498	4,794
Balance, end of period: Individually evaluated for impairment	0	0
Balance, end of period: collectively evaluated for impairment	5,498	4,794
Real Estate Term Other
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	628	656
Charge-Offs	0	(81)
Recoveries	0	17
Provision (benefit)	10	164
Balance, end of period	638	756
Balance, end of period: Individually evaluated for impairment	0	55
Balance, end of period: collectively evaluated for impairment	638	701
Consumer Secured By 1st Deed Of Trust
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	264	285
Charge-Offs	0	0
Recoveries	0	0
Provision (benefit)	0	(11)
Balance, end of period	264	274
Balance, end of period: Individually evaluated for impairment	0	0
Balance, end of period: collectively evaluated for impairment	264	274
Consumer Other
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	397	410
Charge-Offs	(1)	0
Recoveries	3	2
Provision (benefit)	(3)	(10)
Balance, end of period	396	402
Balance, end of period: Individually evaluated for impairment	0	0
Balance, end of period: collectively evaluated for impairment	396	402
Unallocated
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	1,493	1,148
Charge-Offs	0	0
Recoveries	0	0
Provision (benefit)	25	(508)
Balance, end of period	1,518	640
Balance, end of period: Individually evaluated for impairment	0	0
Balance, end of period: collectively evaluated for impairment	$ 1,518	$ 640