Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands			6 Months Ended
		Jan. 01, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities			$ 108,234			$ 117,214
Right-of-use assets			94,143			102,075
Increase in retained earnings			825,205	$ 798,211	$ 828,792	819,018	$ 778,819	$ 753,954
Allowance for loans losses			89,324	$ 75,067	$ 68,211	71,982	$ 73,814	$ 75,312
Reserve for unfunded loan commitments			$ 7,100
Accounting Standards Update [Extensible List]		us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in retained earnings	[1]					13,492
ASU 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lease liabilities						124,100
Right-of-use assets						108,500
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase in retained earnings						13,500
Allowance for loans losses						(20,400)
Reserve for unfunded loan commitments						$ 1,400

[1] Impact due to the adoption of ASU 2016-13, Financial Instruments (Topic 326) (“ASU 2016-13”). See Part I. Item 1. “Notes to Unaudited Consolidated Financial Statements - Note 15: Recent Accounting Pronouncements.”