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Allowance for Loan and Lease Losses - Disaggregation by Impairment Methodology (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Allowance for loan and lease losses:        
Individually evaluated for impairment $ 885 $ 536    
Collectively evaluated for impairment 140,661 141,182    
Total allowance for loan and lease losses 141,546 141,718 $ 138,574 $ 137,253
Loans and leases:        
Individually evaluated for impairment 29,509 30,576    
Collectively evaluated for impairment 13,167,945 13,045,615    
Total loans and leases 13,197,454 13,076,191    
Commercial Lending        
Loans and leases:        
Total loans and leases 7,092,552 6,974,069    
Commercial and Industrial        
Allowance for loan and lease losses:        
Individually evaluated for impairment 429 108    
Collectively evaluated for impairment 31,364 34,393    
Total allowance for loan and lease losses 31,793 34,501 34,365 34,006
Loans and leases:        
Individually evaluated for impairment 10,073 8,719    
Collectively evaluated for impairment 3,193,697 3,200,041    
Total loans and leases 3,203,770 3,208,760    
Commercial Real Estate        
Allowance for loan and lease losses:        
Individually evaluated for impairment 26 32    
Collectively evaluated for impairment 21,171 19,693    
Total allowance for loan and lease losses 21,197 19,725 19,254 18,044
Loans and leases:        
Individually evaluated for impairment 3,907 5,743    
Collectively evaluated for impairment 3,143,397 2,985,040    
Total loans and leases 3,147,304 2,990,783    
Construction        
Allowance for loan and lease losses:        
Collectively evaluated for impairment 5,381 5,813    
Total allowance for loan and lease losses 5,381 5,813 5,976 6,817
Loans and leases:        
Collectively evaluated for impairment 595,491 626,757    
Total loans and leases 595,491 626,757    
Lease Financing        
Allowance for loan and lease losses:        
Collectively evaluated for impairment 411 432    
Total allowance for loan and lease losses 411 432 585 611
Loans and leases:        
Collectively evaluated for impairment 145,987 147,769    
Total loans and leases 145,987 147,769    
Residential        
Allowance for loan and lease losses:        
Individually evaluated for impairment 430 396    
Collectively evaluated for impairment 44,481 44,510    
Total allowance for loan and lease losses 44,911 44,906 43,220 42,852
Loans and leases:        
Individually evaluated for impairment 15,529 16,114    
Collectively evaluated for impairment 4,436,264 4,423,504    
Total loans and leases 4,451,793 4,439,618    
Consumer        
Allowance for loan and lease losses:        
Collectively evaluated for impairment 35,099 35,813    
Total allowance for loan and lease losses 35,099 35,813 30,998 31,249
Loans and leases:        
Collectively evaluated for impairment 1,653,109 1,662,504    
Total loans and leases 1,653,109 1,662,504    
Unallocated        
Allowance for loan and lease losses:        
Collectively evaluated for impairment 2,754 528    
Total allowance for loan and lease losses $ 2,754 $ 528 $ 4,176 $ 3,674