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Fair Value - Financial Instruments not Required to be Carried at Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Lease and lease commitments excluded    
Financing leases $ 160,100 $ 165,100
Book Value    
Financial assets:    
Cash and cash equivalents 692,492 1,034,644
Loans held for sale 397 556
Loans 12,304,025 12,112,303
Financial liabilities:    
Deposits 17,362,422 17,612,122
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 692,489 1,034,644
Loans held for sale 397 559
Loans 12,505,553 12,426,506
Financial liabilities:    
Deposits 17,342,040 17,598,633
Estimated Fair Value | Level 1    
Financial assets:    
Cash and cash equivalents 283,135 367,084
Financial liabilities:    
Deposits 13,296,696 13,438,240
Estimated Fair Value | Level 2    
Financial assets:    
Cash and cash equivalents 409,354 667,560
Loans held for sale 397 559
Financial liabilities:    
Deposits 4,045,344 4,160,393
Estimated Fair Value | Level 3    
Financial assets:    
Loans $ 12,505,553 $ 12,426,506