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Note Loans (Carrying amount of acquired loans accounted for pursuant to ASC310-30 by portfolio) (Details) - ASC Subtopic 310-30 - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount $ 1,883,556 [1] $ 2,108,993 $ 2,301,024
Less: Allowance for loan losses (122,135) (119,505)  
Carrying amount, net of allowance 1,761,421 1,989,488  
Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 801,774 923,424  
Commercial and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 84,465 88,130  
Construction      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 0 170  
Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 982,821 1,079,611  
Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount $ 14,496 $ 17,658  
[1]
At December 31, 2018, includes $1.4 billion of loans considered non-credit impaired at the acquisition date (December 31, 2017 - $1.6 billion).