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Covered Assets and Indemnification Asset - Impaired Loans (Details) - Covered - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2016
Impaired loans            
Unpaid Contractual Principal Balance $ 247,640   $ 247,640     $ 335,091
Recorded Investment with No Allowance 52,765   52,765     110,101
Recorded Investment with Allowance 41,804   41,804     27,572
Total Recorded Investment 94,569   94,569     137,673
Related Allowance 2,108   2,108     344
Average investment in covered impaired loans            
Average investment 98,838 $ 176,007 116,123 $ 195,311    
Non-accrual loans            
Non-accrual loans 3,781   3,781     3,836
Interest income recorded 900   1,200      
Secured            
Average investment in covered impaired loans            
Average investment 396 3,286 775   $ 4,299  
Non-accrual loans            
Non-accrual loans 44   44     52
Unsecured            
Average investment in covered impaired loans            
Average investment 105 1,331 170 1,511    
Secured by Commercial Properties            
Average investment in covered impaired loans            
Average investment 28,110 76,693 39,323 82,477    
Non-accrual loans            
Non-accrual loans           730
Secured by Residential Properties            
Average investment in covered impaired loans            
Average investment 68,843 84,129 73,093 91,424    
Non-accrual loans            
Non-accrual loans 3,438   3,438     3,035
Residential Construction Loans            
Average investment in covered impaired loans            
Average investment       331    
Commercial construction loans and land development            
Average investment in covered impaired loans            
Average investment 1,384 $ 10,568 2,762 $ 15,269    
Non-accrual loans            
Non-accrual loans 299   299     19
PCI loans            
Impaired loans            
Unpaid Contractual Principal Balance 242,883   242,883     330,444
Recorded Investment with No Allowance 48,779   48,779     106,182
Recorded Investment with Allowance 41,804   41,804     27,572
Total Recorded Investment 90,583   90,583     133,754
Related Allowance 2,108   2,108     344
Non-accrual loans            
Non-accrual loans 300   300     400
PCI loans | Secured            
Impaired loans            
Unpaid Contractual Principal Balance 4,010   4,010     10,579
Recorded Investment with No Allowance           1,024
Recorded Investment with Allowance 240   240     189
Total Recorded Investment 240   240     1,213
Related Allowance 46   46     13
PCI loans | Unsecured            
Impaired loans            
Unpaid Contractual Principal Balance 6,324   6,324     3,259
Recorded Investment with No Allowance           299
Recorded Investment with Allowance 41   41      
Total Recorded Investment 41   41     299
Related Allowance 29   29      
PCI loans | Secured by Commercial Properties            
Impaired loans            
Unpaid Contractual Principal Balance 90,640   90,640     143,934
Recorded Investment with No Allowance 1,484   1,484     26,415
Recorded Investment with Allowance 24,214   24,214     26,222
Total Recorded Investment 25,698   25,698     52,637
Related Allowance 1,368   1,368     271
PCI loans | Secured by Residential Properties            
Impaired loans            
Unpaid Contractual Principal Balance 129,275   129,275     148,384
Recorded Investment with No Allowance 47,295   47,295     73,240
Recorded Investment with Allowance 17,023   17,023     1,161
Total Recorded Investment 64,318   64,318     74,401
Related Allowance 384   384     60
PCI loans | Residential Construction Loans            
Impaired loans            
Unpaid Contractual Principal Balance 694   694     766
PCI loans | Commercial construction loans and land development            
Impaired loans            
Unpaid Contractual Principal Balance 11,940   11,940     23,522
Recorded Investment with No Allowance           5,204
Recorded Investment with Allowance 286   286      
Total Recorded Investment 286   286     5,204
Related Allowance 281   281      
Loans excluding PCI Loans            
Impaired loans            
Unpaid Contractual Principal Balance 4,757   4,757     4,647
Recorded Investment with No Allowance 3,986   3,986     3,919
Total Recorded Investment 3,986   3,986     3,919
Loans excluding PCI Loans | Secured            
Impaired loans            
Unpaid Contractual Principal Balance 43   43     52
Recorded Investment with No Allowance 44   44     52
Total Recorded Investment 44   44     52
Loans excluding PCI Loans | Secured by Commercial Properties            
Impaired loans            
Unpaid Contractual Principal Balance           396
Recorded Investment with No Allowance           310
Total Recorded Investment           310
Loans excluding PCI Loans | Secured by Residential Properties            
Impaired loans            
Unpaid Contractual Principal Balance 4,695   4,695     4,175
Recorded Investment with No Allowance 3,929   3,929     3,537
Total Recorded Investment 3,929   3,929     3,537
Loans excluding PCI Loans | Commercial construction loans and land development            
Impaired loans            
Unpaid Contractual Principal Balance 19   19     24
Recorded Investment with No Allowance 13   13     20
Total Recorded Investment $ 13   $ 13     $ 20