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Loans - Narrative Section (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
security
Aug. 01, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument [Line Items]      
Fees and cost related to loans $ 8,100   $ 10,500
Carrying amount of loan investments 2,587,673   2,162,409
Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,052,776   795,396
Non Accrual [Member]      
Debt Instrument [Line Items]      
Recorded investment, non-accrual status 25,600   10,800
Non ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,384,843   1,882,764
Non ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,039,769   772,440
ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 202,830   279,645
ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 13,007   22,956
Pine River Bank Corporation [Member]      
Debt Instrument [Line Items]      
Loans acquired   $ 64,279  
Total Loans [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,587,673   2,162,409
Recorded investment, non-accrual status 25,647   10,813
Total past due loans 39,745   45,417
Total Loans [Member] | Non ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 2,384,843   1,882,764
Recorded investment, non-accrual status 25,647   10,813
Total past due loans 20,042   4,565
Total Loans [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 1,039,769   772,440
Recorded investment, non-accrual status 16,838   4,215
Total past due loans 8,343   498
Total Loans [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 202,830   279,645
Total past due loans 19,703   40,852
Increae (decrease) in past due loans $ (21,200)    
Percentage increae (decrease) in past due loans (51.80%)    
Total Loans [Member] | ASC 310-30 [Member] | Classified Assets      
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 98,400   136,400
Increase (decrease) in carrying amount of loan investments (38,000)    
Total Loans [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 13,007   22,956
Total past due loans 1,404   1,907
Total Loans [Member] | Substandard [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 152,911   165,941
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 61,144   39,626
Number of commercial standard loans | security 4    
Increase (decrease) in carrying amount of loan investments $ 24,500    
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Energy Loans [Member]      
Debt Instrument [Line Items]      
Number of commercial standard loans | security 3    
Increase (decrease) in carrying amount of loan investments $ 16,100    
Total Loans [Member] | Substandard [Member] | Non ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 32,867   19,250
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments 91,767   126,315
Total Loans [Member] | Substandard [Member] | ASC 310-30 [Member] | Commercial Loan [Member]      
Debt Instrument [Line Items]      
Carrying amount of loan investments $ 4,746   $ 11,092