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Loans (Carrying Amounts of Purchased Impaired and Nonimpaired Loans Acquired and Carrying Amount of Loans Covered by Loss Share Agreements (Narrative)) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Allowance for loan and lease losses $ 70,395       $ 61,963       $ 70,395 $ 61,963  
Provision expense 4,903 $ 5,201 $ 4,918 $ 1,635 9,681 $ 5,238 $ 4,831 $ 4,263 16,657 24,013 $ 15,563
2015 Acquisitions                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Allowance for loan and lease losses 86       $ 57       86 57  
Provision expense                 29 $ 719  
2015 Acquisitions | Receivables acquired excluding receivables with deteriorated credit quality                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Contractually required payments of loans acquired 4,590,000               4,590,000    
Estimated fair value of loans acquired 4,470,000               4,470,000    
2015 Acquisitions | Receivables acquired with deteriorated credit quality                      
Accounts, Notes, Loans and Financing Receivable [Line Items]                      
Contractually required payments of loans acquired 50,000               50,000    
Estimated fair value of loans acquired $ 31,600               $ 31,600