Equity Other Comprehensive Income (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, 2019	Dec. 31, 2018	Dec. 31, 2017
Pre- tax
Pre-tax, Net change									$ 35,106	$ (12,115)	$ 8,994
Tax effect
Tax, Net change									9,812	(3,388)	3,569
Net of Tax
Other comprehensive income/(loss), net of tax									25,294	(8,727)	5,425
Net income attributable to the Company, before tax									102,619	117,921	86,787
Income tax expense/(benefit)	$ 6,788	$ 5,517	$ 5,369	$ 4,917	$ 8,651	$ 5,461	$ 17,399	$ 6,026	22,591	37,537	46,196
Net income attributable to the Company	$ 21,244	$ 19,962	$ 19,380	$ 19,442	$ 33,302	$ 17,962	$ 6,434	$ 22,686	80,028	80,384	40,591
Total comprehensive income, pre-tax									137,725	105,806	95,781
Total comprehensive income, tax effect									32,403	34,149	49,765
Total comprehensive income attributable to the Company, net									105,322	71,657	46,016
Accumulated Other Comprehensive Income/ (Loss)
Net of Tax
Other comprehensive income/(loss), net of tax									25,294	(8,727)	5,425
Unrealized gain/(loss) on securities available-for-sale
Pre- tax
Pre-tax, Net gains/ (losses) arising during period									36,092	(13,205)	7,782
Pre-tax, Adjustment for realized gains/ (losses), net									0	(596)	376
Pre-tax, Net change									36,092	(12,609)	7,406
Tax effect
Tax, Net gains/ (losses) arising during period									10,101	(3,702)	3,063
Tax, Adjustment for realized gains/ (losses), net									0	(170)	154
Tax, Net change									10,101	(3,532)	2,909
Net of Tax
Net of tax, Net gains/ (losses) arising during period									25,991	(9,503)	4,719
Net of tax, Adjustment for realized gains/ (losses), net									0	(426)	222
Other comprehensive income/(loss), net of tax									25,991	(9,077)	4,497
Unrealized gain/ (loss) on cash flow hedges, after 2017-12 adoption
Pre- tax
Pre-tax, Net gains/ (losses) arising during period									(46)
Pre-tax, Adjustment for realized gains/ (losses), net									(508)
Pre-tax, Net change									(554)
Tax effect
Tax, Net gains/ (losses) arising during period									(15)
Tax, Adjustment for realized gains/ (losses), net									(148)
Tax, Net change									(163)
Net of Tax
Net of tax, Net gains/ (losses) arising during period									(31)
Net of tax, Adjustment for realized gains/ (losses), net									(360)
Other comprehensive income/(loss), net of tax									(391)
Unrealized gain/ (loss) on cash flow hedges, before 2017-12 adoption
Pre- tax
Pre-tax, Net gains/ (losses) arising during period										985	325
Pre-tax, Adjustment for realized gains/ (losses), net										(907)	1,179
Pre-tax, Net change										78	1,504
Tax effect
Tax, Net gains/ (losses) arising during period										285	135
Tax, Adjustment for realized gains/ (losses), net										(261)	491
Tax, Net change										24	626
Net of Tax
Net of tax, Net gains/ (losses) arising during period										700	190
Net of tax, Adjustment for realized gains/ (losses), net										(646)	688
Other comprehensive income/(loss), net of tax										54	878
Unrealized gain/(loss) on other
Pre- tax
Pre-tax, Net gains/ (losses) arising during period									(432)	416	84
Pre-tax, Net change									(432)	416	84
Tax effect
Tax, Net gains/ (losses) arising during period									(126)	120	34
Tax, Net change									(126)	120	34
Net of Tax
Net of tax, Net gains/ (losses) arising during period									(306)	296	50
Other comprehensive income/(loss), net of tax									$ (306)	$ 296	$ 50