Acquisition of MainStreet Bankshares, Inc. - (Details)
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9 Months Ended |
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Jan. 01, 2015
USD ($)
bank
$ / shares
shares
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Sep. 30, 2016
USD ($)
shares
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Sep. 30, 2015
USD ($)
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Dec. 31, 2015
USD ($)
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[1] |
| Business Acquisition [Line Items] |
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| Number of shares granted in conjunction with the acquisition (in shares) | shares |
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0
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| Net loans |
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$ 1,070,444,000
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$ 992,924,000
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| Assets |
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1,615,534,000
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$ 1,512,437,000
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1,547,599,000
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| Deposits |
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1,306,008,000
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$ 1,262,660,000
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| MainStreet BankShares, Inc. [Member] |
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| Business Acquisition [Line Items] |
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| Net loans |
$ 122,000,000
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| Assets |
164,000,000
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| Deposits |
$ 137,000,000
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| Franklin Community Bank, N.A. [Member] | Virginia [Member] |
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| Business Acquisition [Line Items] |
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| Number of banking offices served (banks) | bank |
3
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| MainStreet BankShares, Inc. [Member] |
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| Business Acquisition [Line Items] |
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| Shares received by acquiree entity in exchange of acquirer entity's common stock (in dollars per share) | $ / shares |
$ 3.46
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| Shares received by acquiree entity in exchange of acquirer entity's common stock (in shares) | shares |
0.482
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| Share exchange ratio on acquisitions |
0.643
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| Cash dividends received for purchase of acquisition |
$ 6,000,000
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| Amount of loan taken to fund merger |
$ 0
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| Number of shares granted in conjunction with the acquisition (in shares) | shares |
43,086
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| Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract] |
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| Net impact to income before taxes |
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463,000
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1,142,000
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| MainStreet BankShares, Inc. [Member] | Amortization of intangible asset [Member] |
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| Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract] |
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| Intangibles |
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(185,000)
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(220,000)
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| MainStreet BankShares, Inc. [Member] | CD [Member] | Interest on deposits [Member] |
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| Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract] |
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| Financial assets |
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0
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216,000
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| MainStreet BankShares, Inc. [Member] | Brokered CD [Member] | Interest on deposits [Member] |
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| Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract] |
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| Financial assets |
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0
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2,000
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| MainStreet BankShares, Inc. [Member] | Acquired Impaired Loans [Member] | Interest and fees on loans [Member] |
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| Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract] |
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| Financial assets |
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445,000
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827,000
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| MainStreet BankShares, Inc. [Member] | Performing [Member] | Interest and fees on loans [Member] |
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| Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments [Abstract] |
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| Financial assets |
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$ 203,000
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$ 317,000
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