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Purchased Loans - Average Recorded Investment and Interest Income on Impaired Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | $ 9,636 | $ 9,561
Interest Income Recognized | 43 | 141
Purchased with deteriorated credit quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 191,110 | 197,449
Interest Income Recognized | 2,456 | 8,154
Commercial, financial, agricultural | Purchased loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 2,533 | 2,312
Interest Income Recognized | 2 | 6
Commercial, financial, agricultural | Purchased loans | Purchased with deteriorated credit quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 32,150 | 35,304
Interest Income Recognized | 283 | 1,145
Real estate – construction: | Purchased loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 256 | 256
Interest Income Recognized | 0 | 3
Real estate – construction: | Purchased loans | Purchased with deteriorated credit quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 558 | 560
Interest Income Recognized | 8 | 8
Real estate – 1-4 family mortgage: | Purchased loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 5,364 | 5,468
Interest Income Recognized | 30 | 96
Real estate – 1-4 family mortgage: | Purchased loans | Purchased with deteriorated credit quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 38,031 | 38,682
Interest Income Recognized | 538 | 1,699
Real estate – commercial mortgage: | Purchased loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 1,150 | 1,185
Interest Income Recognized | 11 | 36
Real estate – commercial mortgage: | Purchased loans | Purchased with deteriorated credit quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 117,179 | 119,327
Interest Income Recognized | 1,541 | 5,015
Installment loans to individuals | Purchased loans |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 333 | 340
Interest Income Recognized | 0 | 0
Installment loans to individuals | Purchased loans | Purchased with deteriorated credit quality |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Average Recorded Investment | 3,192 | 3,576
Interest Income Recognized | $ 86 | $ 287

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