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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amounts Reclassified from AOCI [Abstract]
Securities gains (losses)	$ (85)	$ 73	$ 522
Tax expense (benefit)	11,314	17,018	19,118
Net income	59,228	51,493	47,346
Unrealized Gains (Losses) on AFS Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]
Amounts Reclassified from AOCI [Abstract]
Securities gains (losses)	(821)	73	522
Tax expense (benefit)	(172)	26	183
Net income	$ (649)	$ 47	$ 339

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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