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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | $ 7,601 |  | $ 7,601 |  | $ 9,203
Recorded Investment With Allowance | 3,262 |  | 3,262 |  | 2,892
Recorded Investment With No Allowance | 3,649 |  | 3,649 |  | 5,672
Total Recorded Investment | 6,911 |  | 6,911 |  | 8,564
Related Allowance | 169 |  | 169 |  | 107
Average Recorded Investment | 7,423 | $ 7,482 | 7,550 | $ 7,378 |
Interest Income Recognized | 49 | 117 | 160 | 199 |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 286,613 |  | 286,613 |  | 277,709
Recorded Investment With Allowance | 82,173 |  | 82,173 |  | 87,484
Recorded Investment With No Allowance | 149,890 |  | 149,890 |  | 139,776
Total Recorded Investment | 232,063 |  | 232,063 |  | 227,260
Related Allowance | 2,828 |  | 2,828 |  | 1,777
Average Recorded Investment | 207,050 | 258,209 | 211,356 | 261,367 |
Interest Income Recognized | 2,506 | 3,911 | 8,184 | 10,230 |
Commercial, financial, agricultural |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 391 |  | 391 |  | 757
Recorded Investment With Allowance | 327 |  | 327 |  | 625
Recorded Investment With No Allowance | 2 |  | 2 |  | 74
Total Recorded Investment | 329 |  | 329 |  | 699
Related Allowance | 44 |  | 44 |  | 52
Average Recorded Investment | 331 | 413 | 334 | 332 |
Interest Income Recognized | 3 | 6 | 8 | 9 |
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 43,724 |  | 43,724 |  | 24,179
Recorded Investment With Allowance | 4,680 |  | 4,680 |  | 5,768
Recorded Investment With No Allowance | 27,959 |  | 27,959 |  | 9,547
Total Recorded Investment | 32,639 |  | 32,639 |  | 15,315
Related Allowance | 360 |  | 360 |  | 312
Average Recorded Investment | 11,705 | 14,201 | 12,117 | 13,530 |
Interest Income Recognized | 162 | 507 | 579 | 988 |
Real estate – construction |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 520 |  | 520 |  | 1,207
Recorded Investment With Allowance | 520 |  | 520 |  | 0
Recorded Investment With No Allowance | 0 |  | 0 |  | 1,199
Total Recorded Investment | 520 |  | 520 |  | 1,199
Related Allowance | 5 |  | 5 |  | 0
Average Recorded Investment | 520 | 829 | 520 | 741 |
Interest Income Recognized | 1 | 62 | 2 | 62 |
Real estate – 1-4 family mortgage |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 4,924 |  | 4,924 |  | 6,173
Recorded Investment With Allowance | 834 |  | 834 |  | 1,385
Recorded Investment With No Allowance | 3,495 |  | 3,495 |  | 4,225
Total Recorded Investment | 4,329 |  | 4,329 |  | 5,610
Related Allowance | 12 |  | 12 |  | 45
Average Recorded Investment | 4,817 | 5,174 | 4,907 | 5,221 |
Interest Income Recognized | 33 | 41 | 107 | 103 |
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 62,126 |  | 62,126 |  | 65,049
Recorded Investment With Allowance | 13,469 |  | 13,469 |  | 15,910
Recorded Investment With No Allowance | 35,724 |  | 35,724 |  | 38,059
Total Recorded Investment | 49,193 |  | 49,193 |  | 53,969
Related Allowance | 505 |  | 505 |  | 572
Average Recorded Investment | 51,957 | 67,802 | 53,093 | 68,933 |
Interest Income Recognized | 621 | 808 | 1,941 | 2,301 |
Real estate – commercial mortgage |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 1,521 |  | 1,521 |  | 901
Recorded Investment With Allowance | 1,337 |  | 1,337 |  | 728
Recorded Investment With No Allowance | 152 |  | 152 |  | 165
Total Recorded Investment | 1,489 |  | 1,489 |  | 893
Related Allowance | 104 |  | 104 |  | 6
Average Recorded Investment | 1,511 | 899 | 1,545 | 915 |
Interest Income Recognized | 12 | 8 | 43 | 25 |
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 171,754 |  | 171,754 |  | 186,720
Recorded Investment With Allowance | 63,323 |  | 63,323 |  | 65,108
Recorded Investment With No Allowance | 81,930 |  | 81,930 |  | 91,230
Total Recorded Investment | 145,253 |  | 145,253 |  | 156,338
Related Allowance | 1,961 |  | 1,961 |  | 892
Average Recorded Investment | 141,780 | 174,394 | 144,530 | 177,039 |
Interest Income Recognized | 1,705 | 2,578 | 5,610 | 6,886 |
Installment loans to individuals |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 245 |  | 245 |  | 165
Recorded Investment With Allowance | 244 |  | 244 |  | 154
Recorded Investment With No Allowance | 0 |  | 0 |  | 9
Total Recorded Investment | 244 |  | 244 |  | 163
Related Allowance | 4 |  | 4 |  | 4
Average Recorded Investment | 244 | 167 | 244 | 169 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 9,009 |  | 9,009 |  | 1,761
Recorded Investment With Allowance | 701 |  | 701 |  | 698
Recorded Investment With No Allowance | 4,277 |  | 4,277 |  | 940
Total Recorded Investment | 4,978 |  | 4,978 |  | 1,638
Related Allowance | 2 |  | 2 |  | $ 1
Average Recorded Investment | 1,608 | 1,812 | 1,616 | 1,865 |
Interest Income Recognized | $ 18 | $ 18 | $ 54 | $ 55 |

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