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Summary of Significant Accounting Policies (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 02, 2016 USD ($) | Dec. 31, 2016 USD ($) vote branch | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 01, 2016 $ / shares
Property, Plant and Equipment [Line Items] |  |  |  |  |
Net impact from FDIC shared-loss termination |  | $ 16,559,000 | $ 0 | $ 0 |
Gain on acquisitions |  | 5,831,000 | 42,930,000 | $ 0 |
Nonmarketable Securities and Federal Home Loan Bank Stock |  | $ 43,800,000 | 37,700,000 |  |
Period fair values are subject to refinement |  | 1 year |  |  |
Number of branches | branch |  | 550 |  |  |
Net deferred fees on non-PCI loans |  | $ 6,700,000 | 16,600,000 |  |
Baseline for measurement |  | 500,000 |  |  |
Securities Sold under Agreements to Repurchase |  | 620,772,000 | 622,182,000 |  |
Short-term borrowings |  | 603,487,000 | 594,733,000 |  |
Amortization Method Qualified Affordable Housing Project Investments |  | $ 109,800,000 | $ 85,600,000 |  |
Class A Common Stock |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Votes per share of common stock | vote |  | 1 |  |  |
Class B Common Stock |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Votes per share of common stock | vote |  | 16 |  |  |
Premises | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated useful life of asset |  | 7 years |  |  |
Premises | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated useful life of asset |  | 40 years |  |  |
Furniture, Software, and Equipment | Minimum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated useful life of asset |  | 3 years |  |  |
Furniture, Software, and Equipment | Maximum |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Estimated useful life of asset |  | 10 years |  |  |
Cordia Bancorp Inc. |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |
Business Acquisition, Share Price | $ / shares |  |  |  |  | $ 5.15
Total purchase price | $ 37,053,000 |  |  |  |

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