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Other Comprehensive Income - Amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Realized gain on sale of investment securities													$ 1,517	$ 97	$ 542
Interest income (expense) derivative deposits													(91,026)	(60,210)	(27,286)
Income tax (expense) benefit	$ (14,317)	$ (14,149)	$ (13,487)	$ (11,895)	$ (13,197)	$ (13,928)	$ (12,528)	$ (12,279)	$ (35,396)	$ (17,409)	$ (17,382)	$ (15,318)	(53,848)	(51,932)	(85,504)
Amounts reclassified from accumulated other comprehensive income (loss)													(1,971)	(490)	(1,323)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Realized gain on sale of investment securities													1,517	97	542
Interest income (expense) derivative deposits													1,198	560	(1,592)
Income tax (expense) benefit													(744)	(167)	399
Amounts reclassified from accumulated other comprehensive income (loss)													$ 1,971	$ 490	$ (651)

X

- Definition

The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities.

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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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Aggregate amount of interest expense on all deposits.

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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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