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Loans - Accretable yield balance for acquired credit impaired loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans
Decline in accretable yield balance	$ 34,700
Acquired credit impaired loans
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans
Balance at beginning of period	116,754	$ 133,096
Park Sterling Corporation ("Park Sterling") acquisition Day 1 adjustment		(1,460)
Contractual interest income	(26,515)	(33,115)
Accretion on acquired credit impaired loans	(17,813)	(19,004)
Reclass of nonaccretable difference due to improvement in expected cash flows	9,826	37,501
Other changes, net	(154)	(264)
Balance at end of period	82,098	116,754
Accretion income	44,300
Improved expected cash flows	9,800
Contractual principal and interest	452,818
Acquired non-credit impaired loans accounted under FASB 310 20
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans
After fair value adjustment	1,800,000
Acquired loans accounted under FASB ASC 310 20
Changes in the carrying amount of accretable difference for acquired impaired and non-impaired loans
Contractual principal and interest	1,800,000	2,600,000
After fair value adjustment		2,600,000
Fair value adjustment	$ 20,300	$ 33,400

X

- Definition

Amount of contractual interest income adjusted in 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.

+ References

No definition available.

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- Definition

Represents the net increase (decrease) from other changes during the period affecting a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans not accounted for as debt securities.

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Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality after fair value adjustment.

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Amount of addition (reduction) to the amount of certain loans acquired in transfer not accounted for as debt securities on account of fair value adjustment.

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Amount of additions 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 acquisition on adjustment.

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Current period recognition due to accretion of the excess of a loan's cash flows expected to be collected over the investor's initial investment in the loan for loans accounted for as debt securities, with evidence of deterioration 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 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 accretion recognized for 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 decrease from reclassification to nonaccretable difference 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 contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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The increase (decrease) in accreditable yield (the excess of the loan's cash flows expected to be collected over the investor's initial investment in the loan) for the period.

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