Covered Loans Receivable (Impaired Loans) (Details) (Covered Impaired Loans, USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	$ 2,240,000	$ 17,000
Recorded Investment With Specific Valuation Allowance	1,835,000	4,201,000
Total Recorded Investment	4,075,000	4,218,000
Unpaid Contractual Principal Balance	5,482,000	4,192,000
Related Specific Valuation Allowance	423,000	660,000
Average Recorded Investment on Impaired Loans	4,092,000	1,963,000	234,000
Nonaccrual
Financing Receivable, Impaired [Line Items]
Interest income recognized on impaired loans	0	0	0
Restructured Performing
Financing Receivable, Impaired [Line Items]
Interest income recognized on impaired loans	5,000	16,000	7,000
One-to-four Family Residential
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance		0
Recorded Investment With Specific Valuation Allowance		450,000
Total Recorded Investment		450,000
Unpaid Contractual Principal Balance		423,000
Related Specific Valuation Allowance		31,000
Average Recorded Investment on Impaired Loans	90,000	459,000	187,000
Commercial Business
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	2,240,000	10,000
Recorded Investment With Specific Valuation Allowance	1,650,000	3,751,000
Total Recorded Investment	3,890,000	3,761,000
Unpaid Contractual Principal Balance	5,292,000	3,761,000
Related Specific Valuation Allowance	370,000	629,000
Average Recorded Investment on Impaired Loans	3,959,000	1,484,000	21,000
Commercial Business | Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	2,240,000	10,000
Recorded Investment With Specific Valuation Allowance	94,000	3,751,000
Total Recorded Investment	2,334,000	3,761,000
Unpaid Contractual Principal Balance	3,696,000	3,761,000
Related Specific Valuation Allowance	9,000	629,000
Average Recorded Investment on Impaired Loans	3,421,000	1,484,000	21,000
Commercial Business | Owner-occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0
Recorded Investment With Specific Valuation Allowance	1,132,000
Total Recorded Investment	1,132,000
Unpaid Contractual Principal Balance	1,156,000
Related Specific Valuation Allowance	295,000
Average Recorded Investment on Impaired Loans	367,000	0	0
Commercial Business | Non-owner Occupied Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0
Recorded Investment With Specific Valuation Allowance	424,000
Total Recorded Investment	424,000
Unpaid Contractual Principal Balance	440,000
Related Specific Valuation Allowance	66,000
Average Recorded Investment on Impaired Loans	171,000	0	0
Real Estate Construction and Land Development
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0
Recorded Investment With Specific Valuation Allowance	179,000
Total Recorded Investment	179,000
Unpaid Contractual Principal Balance	182,000
Related Specific Valuation Allowance	51,000
Average Recorded Investment on Impaired Loans	36,000	0	0
Real Estate Construction and Land Development | One-to-four Family Residential
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0
Recorded Investment With Specific Valuation Allowance	179,000
Total Recorded Investment	179,000
Unpaid Contractual Principal Balance	182,000
Related Specific Valuation Allowance	51,000
Average Recorded Investment on Impaired Loans	36,000	0	0
Consumer
Financing Receivable, Impaired [Line Items]
Recorded Investment With No Specific Valuation Allowance	0	7,000
Recorded Investment With Specific Valuation Allowance	6,000	0
Total Recorded Investment	6,000	7,000
Unpaid Contractual Principal Balance	8,000	8,000
Related Specific Valuation Allowance	2,000	0
Average Recorded Investment on Impaired Loans	$ 7,000	$ 20,000	$ 26,000