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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts Reclassified from AOCI [Abstract]
Securities gains (losses)	$ 783	$ (85)	$ 73
Tax expense (benefit)	7,452	11,314	17,018
Net income	64,540	59,228	51,493
Unrealized Gains (Losses) on AFS Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]
Amounts Reclassified from AOCI [Abstract]
Securities gains (losses)	3	(821)	73
Tax expense (benefit)	1	(172)	26
Net income	$ 2	$ (649)	$ 47

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Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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