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Loans - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment        
Beginning balance $ 109,984      
Ending balance 110,284      
Allowance for loan losses        
Loans individually evaluated for impairment     $ 8,638 $ 6,804
Loans collectively evaluated for impairment     101,646 102,760
Loans accounted for under ASC 310-30     0 420
Total allowance for loan losses 109,984   110,284 109,984
Recorded investment (loan balance)        
Loans individually evaluated for impairment     139,204 130,873
Loans collectively evaluated for impairment     12,003,070 11,713,883
Loans acquired with deteriorated credit quality     3,181,774 3,425,023
Total loans     15,324,048 15,269,779
Commercial loan portfolio        
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment        
Beginning balance 83,179      
Ending balance 84,010      
Allowance for loan losses        
Loans individually evaluated for impairment     7,578 5,474
Loans collectively evaluated for impairment     76,432 77,285
Loans accounted for under ASC 310-30     0 420
Total allowance for loan losses 83,179   84,010 83,179
Recorded investment (loan balance)        
Loans individually evaluated for impairment     114,426 105,038
Loans collectively evaluated for impairment     7,441,568 7,268,932
Loans acquired with deteriorated credit quality     1,955,837 2,137,897
Total loans     9,511,831 9,511,867
Consumer loan portfolio        
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment        
Beginning balance 26,805      
Ending balance 26,274      
Allowance for loan losses        
Loans individually evaluated for impairment     1,060 1,330
Loans collectively evaluated for impairment     25,214 25,475
Loans accounted for under ASC 310-30     0 0
Total allowance for loan losses 26,805   26,274 26,805
Recorded investment (loan balance)        
Loans individually evaluated for impairment     24,778 25,835
Loans collectively evaluated for impairment     4,561,502 4,444,951
Loans acquired with deteriorated credit quality     1,225,937 1,287,126
Total loans     5,812,217 5,757,912
Acquired Loan Portfolio [Member]        
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment        
Beginning balance 420      
Provision for loan losses (420)      
Charge-offs 0      
Recoveries 0      
Ending balance 0      
Allowance for loan losses        
Total allowance for loan losses 420   0 420
Acquired Loan Portfolio [Member] | Commercial loan portfolio        
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment        
Beginning balance 420      
Provision for loan losses (420)      
Charge-offs 0      
Recoveries 0      
Ending balance 0      
Allowance for loan losses        
Total allowance for loan losses 420   0 420
Acquired Loan Portfolio [Member] | Consumer loan portfolio        
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment        
Beginning balance 0      
Provision for loan losses 0      
Charge-offs 0      
Recoveries 0      
Ending balance 0      
Allowance for loan losses        
Total allowance for loan losses 0   0 0
Originated Loan Portfolio        
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment        
Beginning balance 109,564 $ 91,887    
Provision for loan losses 2,479 6,256    
Charge-offs (3,205) (4,824)    
Recoveries 1,446 1,443    
Ending balance 110,284 94,762    
Allowance for loan losses        
Total allowance for loan losses 109,564 91,887 110,284 109,564
Originated Loan Portfolio | Commercial loan portfolio        
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment        
Beginning balance 82,759 66,133    
Provision for loan losses 1,864 3,400    
Charge-offs (1,434) (2,594)    
Recoveries 821 805    
Ending balance 84,010 67,744    
Allowance for loan losses        
Total allowance for loan losses 82,759 66,133 84,010 82,759
Originated Loan Portfolio | Consumer loan portfolio        
Schedule of allowance and recorded investment related to financing receivables segregated by portfolio segment        
Beginning balance 26,805 25,754    
Provision for loan losses 615 2,856    
Charge-offs (1,771) (2,230)    
Recoveries 625 638    
Ending balance 26,274 27,018    
Allowance for loan losses        
Total allowance for loan losses $ 26,805 $ 25,754 $ 26,274 $ 26,805