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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | $ 9,885 |  | $ 9,885 |  | $ 9,580
Recorded Investment With Allowance | 5,312 |  | 5,312 |  | 4,869
Recorded Investment With No Allowance | 3,823 |  | 3,823 |  | 3,961
Total Recorded Investment | 9,135 |  | 9,135 |  | 8,830
Related Allowance | 252 |  | 252 |  | 537
Average Recorded Investment | 9,133 | $ 7,224 | 9,128 | $ 7,361 |
Interest Income Recognized | 50 | 49 | 98 | 110 |
Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 238,868 |  | 238,868 |  | 272,216
Recorded Investment With Allowance | 73,982 |  | 73,982 |  | 78,611
Recorded Investment With No Allowance | 117,363 |  | 117,363 |  | 143,643
Total Recorded Investment | 191,345 |  | 191,345 |  | 222,254
Related Allowance | 2,666 |  | 2,666 |  | 2,552
Average Recorded Investment | 193,002 | 231,812 | 196,333 | 233,943 |
Interest Income Recognized | 2,728 | 2,790 | 5,699 | 5,678 |
Commercial, financial, agricultural |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 1,038 |  | 1,038 |  | 671
Recorded Investment With Allowance | 687 |  | 687 |  | 600
Recorded Investment With No Allowance | 335 |  | 335 |  | 11
Total Recorded Investment | 1,022 |  | 1,022 |  | 611
Related Allowance | 63 |  | 63 |  | 173
Average Recorded Investment | 1,010 | 380 | 941 | 383 |
Interest Income Recognized | 2 | 3 | 4 | 6 |
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 38,140 |  | 38,140 |  | 44,403
Recorded Investment With Allowance | 4,064 |  | 4,064 |  | 3,779
Recorded Investment With No Allowance | 19,562 |  | 19,562 |  | 25,364
Total Recorded Investment | 23,626 |  | 23,626 |  | 29,143
Related Allowance | 171 |  | 171 |  | 161
Average Recorded Investment | 23,976 | 12,815 | 25,667 | 13,051 |
Interest Income Recognized | 388 | 192 | 863 | 417 |
Lease financing |  |  |  |  |
Impaired loans |  |  |  |  |
Average Recorded Investment |  |  | 0 | 0 |
Interest Income Recognized |  |  | 0 | 0 |
Lease financing | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Average Recorded Investment |  |  | 0 | 0 |
Interest Income Recognized |  |  | 0 | 0 |
Real estate – construction |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 256 |  | 256 |  | 576
Recorded Investment With Allowance | 256 |  | 256 |  | 576
Recorded Investment With No Allowance | 0 |  | 0 |  | 0
Total Recorded Investment | 256 |  | 256 |  | 576
Related Allowance | 2 |  | 2 |  | 5
Average Recorded Investment | 256 | 0 | 256 | 0 |
Interest Income Recognized | 0 | 0 | 3 | 0 |
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Average Recorded Investment |  |  | 0 | 0 |
Interest Income Recognized |  |  | 0 | 0 |
Real estate – 1-4 family mortgage |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 6,095 |  | 6,095 |  | 5,787
Recorded Investment With Allowance | 2,194 |  | 2,194 |  | 1,381
Recorded Investment With No Allowance | 3,234 |  | 3,234 |  | 3,780
Total Recorded Investment | 5,428 |  | 5,428 |  | 5,161
Related Allowance | 21 |  | 21 |  | 18
Average Recorded Investment | 5,415 | 5,135 | 5,450 | 5,252 |
Interest Income Recognized | 36 | 34 | 66 | 74 |
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 51,209 |  | 51,209 |  | 53,823
Recorded Investment With Allowance | 10,753 |  | 10,753 |  | 12,169
Recorded Investment With No Allowance | 31,926 |  | 31,926 |  | 36,074
Total Recorded Investment | 42,679 |  | 42,679 |  | 48,243
Related Allowance | 515 |  | 515 |  | 488
Average Recorded Investment | 43,011 | 54,634 | 43,360 | 55,293 |
Interest Income Recognized | 571 | 647 | 1,161 | 1,320 |
Real estate – commercial mortgage |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 2,110 |  | 2,110 |  | 2,266
Recorded Investment With Allowance | 1,851 |  | 1,851 |  | 2,066
Recorded Investment With No Allowance | 213 |  | 213 |  | 146
Total Recorded Investment | 2,064 |  | 2,064 |  | 2,212
Related Allowance | 163 |  | 163 |  | 338
Average Recorded Investment | 2,082 | 1,462 | 2,109 | 1,479 |
Interest Income Recognized | 12 | 12 | 25 | 30 |
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 142,859 |  | 142,859 |  | 165,700
Recorded Investment With Allowance | 58,507 |  | 58,507 |  | 62,003
Recorded Investment With No Allowance | 63,191 |  | 63,191 |  | 78,435
Total Recorded Investment | 121,698 |  | 121,698 |  | 140,438
Related Allowance | 1,978 |  | 1,978 |  | 1,901
Average Recorded Investment | 122,455 | 162,712 | 123,526 | 163,959 |
Interest Income Recognized | 1,674 | 1,933 | 3,474 | 3,905 |
Installment loans to individuals |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 386 |  | 386 |  | 280
Recorded Investment With Allowance | 324 |  | 324 |  | 246
Recorded Investment With No Allowance | 41 |  | 41 |  | 24
Total Recorded Investment | 365 |  | 365 |  | 270
Related Allowance | 3 |  | 3 |  | 3
Average Recorded Investment | 370 | 247 | 372 | 247 |
Interest Income Recognized | 0 | 0 | 0 | 0 |
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality |  |  |  |  |
Impaired loans |  |  |  |  |
Unpaid Contractual Principal Balance | 6,660 |  | 6,660 |  | 8,290
Recorded Investment With Allowance | 658 |  | 658 |  | 660
Recorded Investment With No Allowance | 2,684 |  | 2,684 |  | 3,770
Total Recorded Investment | 3,342 |  | 3,342 |  | 4,430
Related Allowance | 2 |  | 2 |  | $ 2
Average Recorded Investment | 3,560 | 1,651 | 3,780 | 1,640 |
Interest Income Recognized | $ 95 | $ 18 | $ 201 | $ 36 |

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