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Accumulated Other Comprehensive Income Amounts reclassified from Accumulated 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	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains (losses), net									$ 2,132	$ (89)	$ (11)
Income before income taxes	$ 58,032	$ 63,105	$ 63,818	$ 56,656	$ 55,482	$ 57,821	$ 51,748	$ 46,785	241,611	211,836	177,983
Income Tax Expense (Benefit)	(11,903)	(12,378)	(12,094)	(10,785)	(10,734)	(11,406)	(9,999)	(6,815)	(47,160)	(38,954)	(65,155)
Net income	$ 46,129	$ 50,727	$ 51,724	$ 45,871	$ 44,748	$ 46,415	$ 41,749	$ 39,970	194,451	172,882	112,828
Compensation and employee benefits									212,867	200,199	169,674
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment securities gains (losses), net									2,132	106	(11)
Income before income taxes									2,132	106	(11)
Income Tax Expense (Benefit)									(496)	(25)	4
Net income									1,636	81	(7)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes									(319)	(319)	(350)
Income Tax Expense (Benefit)									74	74	127
Net income									(245)	(245)	(223)
Compensation and employee benefits									(319)	(319)	(350)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes									595	0	0
Income Tax Expense (Benefit)									(138)	0	0
Net income									457	0	0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net									$ 595	$ 0	0
Accounting Standards Update 2018-02 [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption												$ 0
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption											(4,082)	$ (4,082)
Accounting Standards Update 2018-02 [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption											(3,691)
Accounting Standards Update 2018-02 [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption											$ (391)

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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Amount of expense for salary, wage, profit sharing; incentive and equity-based compensation; and other employee benefit.

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