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Loans and Allowance for Loan Losses - Rollforward of Purchase Credit Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Gross Carrying Value
Gross carrying value, beginning balance	$ 42,837	$ 74,324
Acquisitions	1,883	0
Year-to-date settlements	15,176	31,487
Gross carrying value, ending balance	29,544	42,837
Accretable Yield
Accretable yield, beginning balance	(114)	(132)
Acquisitions	0	0
Reclassification of yield from nonaccretable to accretable	(7,505)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Period Increase (Decrease)	2,818	18
Accretable yield, ending balance	(4,801)	(114)
Nonaccretable Yield
Nonaccretable yield, beginning balance	(17,394)	(31,537)
Acquisitions	0	0
Reclassification of yield from nonaccretable to accretable	(7,505)
Year-to-date settlements	6,061	14,143
Nonaccretable yield, ending balance	(3,828)	(17,394)
Net Carrying Value
Net carrying value, beginning balance	25,329	42,655
Acquisitions	1,883	0
Year-to-date settlements	(6,297)	(17,326)
Net carrying value, ending balance	$ 20,915	$ 25,329

X

- Definition

The amount of additions due to acquisition to the aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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- Definition

The amount of additions due to acquisition to the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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- Definition

For receivables acquired in a business combination, the amount of acquisitions to the fair value of the receivables acquired.

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For receivables acquired in a business combination, the amount of settlements to the fair value of the receivables acquired.

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For receivables acquired in a business combination, the amount of acquisitions to the gross contractual amounts receivable.

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For receivables acquired in a business combination, the amount of settlements to the gross contractual amounts receivable.

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The amount of settlements of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Certain Loans Acquired in Transfer, Accretable Yield [Roll Forward]

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Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 805
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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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The aggregate excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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Amount of increase (decrease) of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of increase of reclassification from nonaccretable difference to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of reclassification (to) from nonaccretable difference (from) to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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