Business Combinations - Schedule of Purchased Performing Loans and Purchased Credit Impaired Loans Acquired in Transfer - Bank of Commerce (Details) - Bank of Commerce $ in Thousands	Jul. 31, 2014 USD ($)
Business Acquisition [Line Items]
Purchased Performing	$ 46,229
PCI	40,255
Total Loans	86,484
One-to-four family | Retail Consumer Loans
Business Acquisition [Line Items]
Purchased Performing	2,717
PCI	2,979
Total Loans	5,696
Home equity lines of credit | Retail Consumer Loans
Business Acquisition [Line Items]
Purchased Performing	8,823
PCI	317
Total Loans	9,140
Consumer | Retail Consumer Loans
Business Acquisition [Line Items]
Purchased Performing	37
PCI	15
Total Loans	52
Commercial real estate | Commercial
Business Acquisition [Line Items]
Purchased Performing	29,048
PCI	30,047
Total Loans	59,095
Construction and development | Commercial
Business Acquisition [Line Items]
Purchased Performing	202
PCI	3,020
Total Loans	3,222
Commercial and industrial | Commercial
Business Acquisition [Line Items]
Purchased Performing	5,402
PCI	3,877
Total Loans	$ 9,279