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Loans and Allowance for Loan Losses - Textual (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 11,860,000,000   $ 11,860,000,000   $ 10,780,000,000
Recorded investment 47,354,000   47,354,000   43,923,000
Impaired loan, related allowance 459,000   459,000   338,000
Interest income recognized 400,000 $ 350,000 1,100,000 $ 1,050,000  
Average Investment in Impaired Loans $ 44,309,000 $ 54,468,000 $ 44,952,000 $ 52,504,000  
Troubled debt, number of contracts | loan 5 1 7 13  
Balance prior to TDR $ 2,755,000 $ 608,000 $ 2,907,000 $ 9,237,000  
Reserve 402,000   402,000 33,000  
Foreclosed assets and other real estate owned 22,664,000   22,664,000   32,118,000
Risk Rate 6 | Financial Asset Acquired with Credit Deterioration          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans acquired 5,000,000   5,000,000   17,100,000
Risk Ratings 6,7, and 8          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans acquired excluding loans accounted for under ASC Topic 310-30 145,300,000   145,300,000   175,600,000
Risk Ratings 6,7, and 8 | Financial Asset Acquired with Credit Deterioration          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans acquired excluding loans accounted for under ASC Topic 310-30 61,500,000   61,500,000   76,300,000
Residential Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans in process of foreclosure, amount 2,262,000   2,262,000   5,057,000
OREO Received in Full or Partial Satisfaction of Loans | Residential Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Foreclosed assets and other real estate owned 3,610,000   3,610,000   3,828,000
Real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 5,709,067,000   5,709,067,000   4,239,612,000
Recorded investment 26,401,000   26,401,000   31,538,000
Impaired loan, related allowance 268,000   268,000   $ 338,000
Interest income recognized 217,000 223,000 688,000 687,000  
Average Investment in Impaired Loans $ 27,270,000 $ 34,766,000 $ 29,581,000 $ 34,913,000  
Troubled debt, number of contracts | loan 2   3 3  
Balance prior to TDR $ 392,000   $ 453,000 $ 7,818,000  
Real estate | OREO Received in Full or Partial Satisfaction of Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance prior to TDR     $ 294,300 $ 117,000  
Commercial Real Estate | Real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of loans with subsequent default | loan     1 1  
Write-down of impaired loans     $ 66,300    
Transfers of loans     $ 294,300