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Other Comprehensive Income (Details 2) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Realized gain on sale of investment securities													$ 97	$ 542	$ 1,194
Interest income (expense) derivative deposits													(60,210)	(27,286)	(19,248)
Income tax (expense) benefit	$ (13,197)	$ (13,928)	$ (12,528)	$ (12,279)	$ (35,396)	$ (17,409)	$ (17,382)	$ (15,318)	$ (16,429)	$ (15,484)	$ (15,069)	$ (14,413)	(51,932)	(85,504)	(61,395)
Amounts reclassified from accumulated other comprehensive income (loss)													(490)	(1,323)	642
Reclassification out of Accumulated Other Comprehensive Income [Member]
Realized gain on sale of investment securities													97	542	1,194
Interest income (expense) derivative deposits													560	(1,592)	(1,695)
Interest expense derivative borrowings															(569)
Income tax (expense) benefit													(167)	399	428
Amounts reclassified from accumulated other comprehensive income (loss)													$ 490	$ (651)	$ (642)

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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