Loans and Allowance for Loan Losses - Purchased Credit Impaired (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable Allowance For Credit Losses [Line Items]
Acquired with deteriorated credit quality	$ 15,733	$ 16,058
Commercial and Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Acquired with deteriorated credit quality	240	478
Construction
Financing Receivable Allowance For Credit Losses [Line Items]
Acquired with deteriorated credit quality	4,351	4,319
Residential Real Estate | 1-to-4 Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Acquired with deteriorated credit quality	2,000	2,107
Residential Real Estate | Multi-Family Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Acquired with deteriorated credit quality	24	28
Commercial Real Estate | Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Acquired with deteriorated credit quality	4,001	3,782
Commercial Real Estate | Non-Owner Occupied
Financing Receivable Allowance For Credit Losses [Line Items]
Acquired with deteriorated credit quality	5,114	5,340
Consumer and Other
Financing Receivable Allowance For Credit Losses [Line Items]
Acquired with deteriorated credit quality	$ 3	$ 4