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Allowance for Credit Losses - Allocation of Allowance for Loan Losses and Related Loans by Segment (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Allowance for loan losses:        
Individually evaluated for impairment $ 34,850 $ 33,025    
Collectively evaluated for impairment 119,531 118,834    
Total 154,381 151,859 $ 132,862 $ 120,856
Individually evaluated for impairment 163,516 156,625    
Collectively evaluated for impairment 21,255,262 20,688,758    
Total 25,423,118 25,035,469    
Loans acquired with discounts related to credit quality        
Allowance for loan losses:        
Total 4,004,340 4,190,086    
Commercial and Industrial        
Allowance for loan losses:        
Individually evaluated for impairment 31,508 29,684    
Collectively evaluated for impairment 63,122 61,272    
Total 94,630 90,956 66,546 57,232
Individually evaluated for impairment 106,070 97,852    
Collectively evaluated for impairment 3,680,672 3,492,523    
Total 4,504,927 4,331,032    
Commercial and Industrial | Loans acquired with discounts related to credit quality        
Allowance for loan losses:        
Total 718,185 740,657    
Commercial Real Estate        
Allowance for loan losses:        
Individually evaluated for impairment 2,615 2,628    
Collectively evaluated for impairment 45,147 47,022    
Total 47,762 49,650 56,679 54,954
Individually evaluated for impairment 43,855 43,598    
Collectively evaluated for impairment 11,345,274 10,991,059    
Total 14,119,624 13,895,407    
Commercial Real Estate | Loans acquired with discounts related to credit quality        
Allowance for loan losses:        
Total 2,730,495 2,860,750    
Residential Mortgage        
Allowance for loan losses:        
Individually evaluated for impairment 676 600    
Collectively evaluated for impairment 4,463 4,441    
Total 5,139 5,041 4,100 3,605
Individually evaluated for impairment 12,693 13,904    
Collectively evaluated for impairment 3,648,290 3,669,080    
Total 4,071,237 4,111,400    
Residential Mortgage | Loans acquired with discounts related to credit quality        
Allowance for loan losses:        
Total 410,254 428,416    
Consumer        
Allowance for loan losses:        
Individually evaluated for impairment 51 113    
Collectively evaluated for impairment 6,799 6,099    
Total 6,850 6,212 $ 5,537 $ 5,065
Individually evaluated for impairment 898 1,271    
Collectively evaluated for impairment 2,581,026 2,536,096    
Total 2,727,330 2,697,630    
Consumer | Loans acquired with discounts related to credit quality        
Allowance for loan losses:        
Total $ 145,406 $ 160,263