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Loans and Allowance for Loan Losses - Textual (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Sep. 30, 2019
USD ($)
loan
Sep. 30, 2018
USD ($)
loan
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans $ 13,000,000,000.00   $ 13,000,000,000.00   $ 11,720,000,000
Recorded investment 70,007,000   70,007,000   39,770,000
Impaired loan, related allowance 5,279,000   5,279,000   684,000
Interest income recognized 400,000 $ 400,000 1,200,000 $ 1,100,000  
Average Investment in Impaired Loans $ 64,550,000 $ 44,309,000 $ 56,612,000 $ 44,952,000  
Troubled debt, number of contracts | loan 1 6 1 8  
Balance prior to TDR $ 330,000 $ 2,854,000 $ 330,000 $ 3,006,000  
Financial impact on date of restructure 0 402,000 0 402,000  
Foreclosed assets and other real estate owned 19,576,000   19,576,000   25,565,000
Risk Rate 6 | Financial Asset Acquired with Credit Deterioration          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans acquired 3,100,000   3,100,000   4,100,000
Risk Ratings 6,7, and 8          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans acquired excluding loans accounted for under ASC Topic 310-30 146,200,000   146,200,000   119,000,000.0
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 37,400,000   37,400,000   50,400,000
Residential Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans in process of foreclosure, amount 3,925,000   3,925,000   3,899,000
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 4,401,000   4,401,000   3,530,000
Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans 6,792,021,000   6,792,021,000   5,966,453,000
Recorded investment 33,203,000   33,203,000   24,253,000
Impaired loan, related allowance 659,000   659,000   $ 247,000
Interest income recognized 172,000 217,000 526,000 688,000  
Average Investment in Impaired Loans $ 29,631,000 $ 27,270,000 $ 27,123,000 $ 29,581,000  
Troubled debt, number of contracts | loan 1 3 1 4  
Balance prior to TDR $ 330,000 $ 491,000 $ 330,000 $ 552,000  
Financial impact on date of restructure $ 0 $ 212,000 0 212,000  
Real Estate | OREO Received in Full or Partial Satisfaction of Loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Balance prior to TDR     $ 0 $ 294,300  
Commercial Real Estate | Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of loans with subsequent default | loan     4 1  
Write-down of impaired loans     $ 552,000 $ 66,300  
Transfers of loans       $ 294,300