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Purchased Loans - Impaired Loans and Average Recorded Investment and Interest Income Recognized (Details) - Purchased - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | $ 7,378 |  | $ 7,378 |  | $ 9,203
Recorded Investment With Allowance | 2,563 |  | 2,563 |  | 2,892
Recorded Investment With No Allowance | 4,131 |  | 4,131 |  | 5,672
Total Recorded Investment | 6,694 |  | 6,694 |  | 8,564
Related Allowance | 122 |  | 122 |  | 107
Average Recorded Investment | 7,224 | $ 7,836 | 7,361 | $ 7,684 |
Interest Income Recognized | 49 | 78 | 110 | 116 |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 246,550 |  | 246,550 |  | 277,709
Recorded Investment With Allowance | 82,179 |  | 82,179 |  | 87,484
Recorded Investment With No Allowance | 118,862 |  | 118,862 |  | 139,776
Total Recorded Investment | 201,041 |  | 201,041 |  | 227,260
Related Allowance | 2,256 |  | 2,256 |  | 1,777
Average Recorded Investment | 231,812 | 270,769 | 233,943 | 272,564 |
Interest Income Recognized | 2,790 | 3,199 | 5,678 | 6,501 |
Commercial, financial, agricultural |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 439 |  | 439 |  | 757
Recorded Investment With Allowance | 329 |  | 329 |  | 625
Recorded Investment With No Allowance | 49 |  | 49 |  | 74
Total Recorded Investment | 378 |  | 378 |  | 699
Related Allowance | 41 |  | 41 |  | 52
Average Recorded Investment | 380 | 342 | 383 | 347 |
Interest Income Recognized | 3 | 1 | 6 | 3 |
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 18,239 |  | 18,239 |  | 24,179
Recorded Investment With Allowance | 3,845 |  | 3,845 |  | 5,768
Recorded Investment With No Allowance | 6,570 |  | 6,570 |  | 9,547
Total Recorded Investment | 10,415 |  | 10,415 |  | 15,315
Related Allowance | 325 |  | 325 |  | 312
Average Recorded Investment | 12,815 | 14,894 | 13,051 | 14,048 |
Interest Income Recognized | 192 | 252 | 417 | 487 |
Real estate – construction |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance |  |  |  |  | 1,207
Recorded Investment With Allowance |  |  |  |  | 0
Recorded Investment With No Allowance |  |  |  |  | 1,199
Total Recorded Investment |  |  |  |  | 1,199
Related Allowance |  |  |  |  | 0
Real estate – 1-4 family mortgage |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 5,225 |  | 5,225 |  | 6,173
Recorded Investment With Allowance | 700 |  | 700 |  | 1,385
Recorded Investment With No Allowance | 3,926 |  | 3,926 |  | 4,225
Total Recorded Investment | 4,626 |  | 4,626 |  | 5,610
Related Allowance | 12 |  | 12 |  | 45
Average Recorded Investment | 5,135 | 4,960 | 5,252 | 5,032 |
Interest Income Recognized | 34 | 47 | 74 | 62 |
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 56,339 |  | 56,339 |  | 65,049
Recorded Investment With Allowance | 14,254 |  | 14,254 |  | 15,910
Recorded Investment With No Allowance | 32,122 |  | 32,122 |  | 38,059
Total Recorded Investment | 46,376 |  | 46,376 |  | 53,969
Related Allowance | 528 |  | 528 |  | 572
Average Recorded Investment | 54,634 | 72,933 | 55,293 | 73,656 |
Interest Income Recognized | 647 | 759 | 1,320 | 1,582 |
Real estate – commercial mortgage |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 1,466 |  | 1,466 |  | 901
Recorded Investment With Allowance | 1,287 |  | 1,287 |  | 728
Recorded Investment With No Allowance | 156 |  | 156 |  | 165
Total Recorded Investment | 1,443 |  | 1,443 |  | 893
Related Allowance | 66 |  | 66 |  | 6
Average Recorded Investment | 1,462 | 2,515 | 1,479 | 2,284 |
Interest Income Recognized | 12 | 30 | 30 | 51 |
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 170,327 |  | 170,327 |  | 186,720
Recorded Investment With Allowance | 63,365 |  | 63,365 |  | 65,108
Recorded Investment With No Allowance | 79,328 |  | 79,328 |  | 91,230
Total Recorded Investment | 142,693 |  | 142,693 |  | 156,338
Related Allowance | 1,400 |  | 1,400 |  | 892
Average Recorded Investment | 162,712 | 181,007 | 163,959 | 182,894 |
Interest Income Recognized | 1,933 | 2,169 | 3,905 | 4,394 |
Installment loans to individuals |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 248 |  | 248 |  | 165
Recorded Investment With Allowance | 247 |  | 247 |  | 154
Recorded Investment With No Allowance | 0 |  | 0 |  | 9
Total Recorded Investment | 247 |  | 247 |  | 163
Related Allowance | 3 |  | 3 |  | 4
Average Recorded Investment | 247 | 19 | 247 | 21 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 1,645 |  | 1,645 |  | 1,761
Recorded Investment With Allowance | 715 |  | 715 |  | 698
Recorded Investment With No Allowance | 842 |  | 842 |  | 940
Total Recorded Investment | 1,557 |  | 1,557 |  | 1,638
Related Allowance | 3 |  | 3 |  | $ 1
Average Recorded Investment | 1,651 | 1,935 | 1,640 | 1,966 |
Interest Income Recognized | $ 18 | $ 19 | $ 36 | $ 38 |

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