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Portfolio loans - Allowance for Loan Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Changes in allowance for loan losses |  |  |  |  |  |
Beginning balance | $ 50,915 | $ 52,649 | $ 50,648 | $ 53,582 |  |
Provision for loan loss | 2,517 | 2,258 | 4,628 | 3,266 |  |
Charged-off | (2,941) | (2,553) | (5,410) | (5,483) |  |
Recoveries | 884 | 951 | 1,509 | 1,940 |  |
Ending balance | 51,375 | 53,305 | 51,375 | 53,305 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | $ 4,199 | $ 5,561
Loans collectively evaluated for impairment |  |  |  |  | 47,176 | 45,087
Ending balance | 51,375 | 52,649 | 51,375 | 53,582 | 51,375 | 50,648
Allowance for loan losses and recorded investments in portfolio loans by category |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 40,512 | 47,404
Loans collectively evaluated for impairment |  |  |  |  | 6,487,514 | 5,518,246
PCI loans evaluated for impairment |  |  |  |  | 4,100 | 2,778
Ending balance |  |  |  |  | 6,532,126 | 5,568,428
Commercial |  |  |  |  |  |
Changes in allowance for loan losses |  |  |  |  |  |
Beginning balance | 17,998 | 17,577 | 17,829 | 14,779 |  |
Provision for loan loss | 1,161 | 1,720 | 2,954 | 4,723 |  |
Charged-off | (2,563) | (1,916) | (4,370) | (2,697) |  |
Recoveries | 137 | 205 | 320 | 781 |  |
Ending balance | 16,733 | 17,586 | 16,733 | 17,586 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 2,358 | 4,319
Loans collectively evaluated for impairment |  |  |  |  | 14,375 | 13,510
Ending balance | 17,998 | 17,577 | 17,829 | 14,779 | 16,733 | 17,829
Allowance for loan losses and recorded investments in portfolio loans by category |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 11,336 | 18,441
Loans collectively evaluated for impairment |  |  |  |  | 1,656,731 | 1,386,247
PCI loans evaluated for impairment |  |  |  |  | 31 | 418
Ending balance |  |  |  |  | 1,668,098 | 1,405,106
Commercial real estate |  |  |  |  |  |
Changes in allowance for loan losses |  |  |  |  |  |
Beginning balance | 20,097 | 22,090 | 21,137 | 21,813 |  |
Provision for loan loss | (97) | 909 | (1,186) | 2,445 |  |
Charged-off |  | (110) | (15) | (1,425) |  |
Recoveries | 188 | 158 | 252 | 214 |  |
Ending balance | 20,188 | 23,047 | 20,188 | 23,047 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 1,367 | 1,181
Loans collectively evaluated for impairment |  |  |  |  | 18,821 | 19,956
Ending balance | 20,097 | 22,090 | 21,137 | 21,813 | 20,188 | 21,137
Allowance for loan losses and recorded investments in portfolio loans by category |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 15,723 | 15,318
Loans collectively evaluated for impairment |  |  |  |  | 2,643,721 | 2,349,243
PCI loans evaluated for impairment |  |  |  |  | 2,461 | 2,262
Ending balance |  |  |  |  | 2,661,905 | 2,366,823
Real estate construction |  |  |  |  |  |
Changes in allowance for loan losses |  |  |  |  |  |
Beginning balance | 2,807 | 2,799 | 2,723 | 2,861 |  |
Provision for loan loss | 411 | 35 | 413 | 37 |  |
Charged-off |  |  |  | (97) |  |
Recoveries | 87 | 81 | 169 | 114 |  |
Ending balance | 3,305 | 2,915 | 3,305 | 2,915 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans collectively evaluated for impairment |  |  |  |  | 3,305 | 2,723
Ending balance | 2,807 | 2,799 | 2,723 | 2,915 | 3,305 | 2,723
Allowance for loan losses and recorded investments in portfolio loans by category |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 751 | 453
Loans collectively evaluated for impairment |  |  |  |  | 428,140 | 287,744
PCI loans evaluated for impairment |  |  |  |  | 435 |
Ending balance |  |  |  |  | 429,326 | 288,197
Retail real estate |  |  |  |  |  |
Changes in allowance for loan losses |  |  |  |  |  |
Beginning balance | 9,503 | 9,836 | 8,471 | 13,783 |  |
Provision for loan loss | 941 | (548) | 2,298 | (4,210) |  |
Charged-off | (200) | (412) | (717) | (942) |  |
Recoveries | 369 | 417 | 561 | 662 |  |
Ending balance | 10,613 | 9,293 | 10,613 | 9,293 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 474 | 61
Loans collectively evaluated for impairment |  |  |  |  | 10,139 | 8,410
Ending balance | 9,503 | 9,836 | 10,613 | 9,293 | 10,613 | 8,471
Allowance for loan losses and recorded investments in portfolio loans by category |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 12,668 | 13,159
Loans collectively evaluated for impairment |  |  |  |  | 1,707,529 | 1,466,876
PCI loans evaluated for impairment |  |  |  |  | 1,173 | 98
Ending balance |  |  |  |  | 1,721,370 | 1,480,133
Retail other |  |  |  |  |  |
Changes in allowance for loan losses |  |  |  |  |  |
Beginning balance | 510 | 347 | 488 | 346 |  |
Provision for loan loss | 101 | 142 | 149 | 271 |  |
Charged-off | (178) | (115) | (308) | (322) |  |
Recoveries | 103 | 90 | 207 | 169 |  |
Ending balance | 536 | 464 | 536 | 464 |  |
Allowance for loan losses Ending balance attributed to: |  |  |  |  |  |
Loans collectively evaluated for impairment |  |  |  |  | 536 | 488
Ending balance | $ 510 | $ 347 | $ 536 | $ 464 | 536 | 488
Allowance for loan losses and recorded investments in portfolio loans by category |  |  |  |  |  |
Loans individually evaluated for impairment |  |  |  |  | 34 | 33
Loans collectively evaluated for impairment |  |  |  |  | 51,393 | 28,136
Ending balance |  |  |  |  | $ 51,427 | $ 28,169

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