Covered Loans Receivable (Risk Management) (Details) (Covered Loans, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Segment	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan segments	4
Covered loans receivable, net	$ 126,200	$ 63,754
Allowance for loan losses	(5,576)	(6,167)
Covered loans receivable, net	120,624	57,587
Recorded investment of purchased covered loans no longer covered under FDIC loss sharing agreements	872	2,600
One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	5,990	4,777
Commercial Business
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	105,233	53,681
Commercial Business | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	19,110	14,690
Commercial Business | Owner-occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	59,244	24,366
Commercial Business | Non-owner Occupied Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	26,879	14,625
Real Estate Construction and Land Development
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	6,006	1,556
Real Estate Construction and Land Development | One-to-four Family Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	2,446	1,556
Real Estate Construction and Land Development | Five or More Family Residential and Commercial Properties
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	3,560	0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Covered loans receivable, net	$ 8,971	$ 3,740