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Acquisition Acquired Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Feb. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable      
Interest component of expected cash flows (accretable discount)   $ (4,954) $ 0
BKMU Assets Acquired Liabilities Assumed [Member]      
Financing Receivable      
Contractual required principal and interest at acquisition $ 1,923,920    
Contractual cash flows not expected to be collected (nonaccretable discount) (1,866)    
Expected cash flows at acquisition 1,922,054    
Interest component of expected cash flows (accretable discount) (46,177)    
Fair value of acquired loans 1,875,877    
Acquired Performing Loans | BKMU Assets Acquired Liabilities Assumed [Member]      
Financing Receivable      
Contractual required principal and interest at acquisition 1,899,932    
Contractual cash flows not expected to be collected (nonaccretable discount) 0    
Expected cash flows at acquisition 1,899,932    
Interest component of expected cash flows (accretable discount) (41,324)    
Fair value of acquired loans 1,858,608    
Acquired Impaired Loans | BKMU Assets Acquired Liabilities Assumed [Member]      
Financing Receivable      
Contractual required principal and interest at acquisition 23,988    
Contractual cash flows not expected to be collected (nonaccretable discount) (1,866)    
Expected cash flows at acquisition 22,122    
Interest component of expected cash flows (accretable discount) (4,853)    
Fair value of acquired loans $ 17,269