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Purchased Loans - Impaired Loans and Average Recorded Investment and Interest Income Recognized (Details) - Purchased - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | $ 8,599 |  | $ 8,599 |  | $ 6,674
Recorded Investment With Allowance | 3,587 |  | 3,587 |  | 4,538
Recorded Investment With No Allowance | 4,387 |  | 4,387 |  | 1,847
Total Recorded Investment | 7,974 |  | 7,974 |  | 6,385
Related Allowance | 126 |  | 126 |  | 515
Average Recorded Investment | 7,482 | $ 35,970 | 7,378 | $ 36,708 |
Interest Income Recognized | 117 | 256 | 199 | 681 |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 299,098 |  | 299,098 |  | 340,104
Recorded Investment With Allowance | 90,277 |  | 90,277 |  | 89,257
Recorded Investment With No Allowance | 154,602 |  | 154,602 |  | 182,501
Total Recorded Investment | 244,879 |  | 244,879 |  | 271,758
Related Allowance | 1,925 |  | 1,925 |  | 2,820
Average Recorded Investment | 258,209 | 338,176 | 261,367 | 337,288 |
Interest Income Recognized | 3,911 | 3,983 | 10,230 | 11,826 |
Commercial, financial, agricultural |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 459 |  | 459 |  | 732
Recorded Investment With Allowance | 433 |  | 433 |  | 487
Recorded Investment With No Allowance | 15 |  | 15 |  | 224
Total Recorded Investment | 448 |  | 448 |  | 711
Related Allowance | 66 |  | 66 |  | 310
Average Recorded Investment | 413 | 2,387 | 332 | 2,233 |
Interest Income Recognized | 6 | 28 | 9 | 48 |
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 26,853 |  | 26,853 |  | 20,697
Recorded Investment With Allowance | 6,770 |  | 6,770 |  | 4,555
Recorded Investment With No Allowance | 10,689 |  | 10,689 |  | 7,439
Total Recorded Investment | 17,459 |  | 17,459 |  | 11,994
Related Allowance | 325 |  | 325 |  | 372
Average Recorded Investment | 14,201 | 15,317 | 13,530 | 15,768 |
Interest Income Recognized | 507 | 252 | 988 | 839 |
Real estate – construction |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 1,837 |  | 1,837 |  | 147
Recorded Investment With Allowance | 759 |  | 759 |  | 145
Recorded Investment With No Allowance | 1,074 |  | 1,074 |  | 0
Total Recorded Investment | 1,833 |  | 1,833 |  | 145
Related Allowance | 5 |  | 5 |  | 0
Average Recorded Investment | 829 | 1,010 | 741 | 819 |
Interest Income Recognized | 62 | 26 | 62 | 28 |
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance |  |  |  |  | 1,141
Recorded Investment With Allowance |  |  |  |  | 0
Recorded Investment With No Allowance |  |  |  |  | 840
Total Recorded Investment |  |  |  |  | 840
Related Allowance |  |  |  |  | 0
Average Recorded Investment | 0 | 987 | 0 | 991 |
Interest Income Recognized | 0 | 15 | 0 | 48 |
Real estate – 1-4 family mortgage |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 5,239 |  | 5,239 |  | 3,095
Recorded Investment With Allowance | 1,521 |  | 1,521 |  | 1,496
Recorded Investment With No Allowance | 3,118 |  | 3,118 |  | 1,385
Total Recorded Investment | 4,639 |  | 4,639 |  | 2,881
Related Allowance | 46 |  | 46 |  | 43
Average Recorded Investment | 5,174 | 18,914 | 5,221 | 19,146 |
Interest Income Recognized | 41 | 114 | 103 | 309 |
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 71,858 |  | 71,858 |  | 86,725
Recorded Investment With Allowance | 17,639 |  | 17,639 |  | 21,887
Recorded Investment With No Allowance | 42,130 |  | 42,130 |  | 50,065
Total Recorded Investment | 59,769 |  | 59,769 |  | 71,952
Related Allowance | 614 |  | 614 |  | 841
Average Recorded Investment | 67,802 | 92,830 | 68,933 | 93,900 |
Interest Income Recognized | 808 | 1,056 | 2,301 | 3,000 |
Real estate – commercial mortgage |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 897 |  | 897 |  | 2,485
Recorded Investment With Allowance | 720 |  | 720 |  | 2,275
Recorded Investment With No Allowance | 169 |  | 169 |  | 183
Total Recorded Investment | 889 |  | 889 |  | 2,458
Related Allowance | 5 |  | 5 |  | 48
Average Recorded Investment | 899 | 13,425 | 915 | 14,271 |
Interest Income Recognized | 8 | 87 | 25 | 294 |
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 198,563 |  | 198,563 |  | 229,075
Recorded Investment With Allowance | 65,175 |  | 65,175 |  | 62,449
Recorded Investment With No Allowance | 100,791 |  | 100,791 |  | 122,538
Total Recorded Investment | 165,966 |  | 165,966 |  | 184,987
Related Allowance | 985 |  | 985 |  | 1,606
Average Recorded Investment | 174,394 | 226,533 | 177,039 | 224,004 |
Interest Income Recognized | 2,578 | 2,635 | 6,886 | 7,859 |
Installment loans to individuals |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 167 |  | 167 |  | 215
Recorded Investment With Allowance | 154 |  | 154 |  | 135
Recorded Investment With No Allowance | 11 |  | 11 |  | 55
Total Recorded Investment | 165 |  | 165 |  | 190
Related Allowance | 4 |  | 4 |  | 114
Average Recorded Investment | 167 | 234 | 169 | 239 |
Interest Income Recognized | 0 | 1 | 0 | 2 |
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 1,824 |  | 1,824 |  | 2,466
Recorded Investment With Allowance | 693 |  | 693 |  | 366
Recorded Investment With No Allowance | 992 |  | 992 |  | 1,619
Total Recorded Investment | 1,685 |  | 1,685 |  | 1,985
Related Allowance | 1 |  | 1 |  | $ 1
Average Recorded Investment | 1,812 | 2,509 | 1,865 | 2,625 |
Interest Income Recognized | $ 18 | $ 25 | $ 55 | $ 80 |

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