Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans and leases		$ 356,745	$ 291,420	$ 207,628	$ 157,629	$ 151,069	$ 144,872	$ 144,871
Reserve for Unfunded Commitments		26,368	20,927	8,344	5,106	4,857	4,654	4,523
Commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans and leases		152,828	99,778	55,924	50,847	48,997	47,841	47,904
Reserve for Unfunded Commitments		20,808	15,760	4,564	534	561	603	628
Commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans and leases		152,615	146,607	117,829	73,820	68,353	64,370	63,957
Reserve for Unfunded Commitments		2,921	2,927	2,052	2,539	2,595	2,347	2,250
Residential
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans and leases		40,548	34,251	26,813	24,714	23,654	22,173	22,034
Reserve for Unfunded Commitments		2,061	1,741	1,416	149	157	162	160
Consumer & Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans and leases		10,754	10,784	7,062	8,248	10,065	10,488	10,976
Reserve for Unfunded Commitments		$ 578	$ 499	312	$ 1,884	$ 1,544	$ 1,542	$ 1,485
Accounting Standards Update 2016-13 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment	[1]			(40,181)
Allowance for credit losses on loans and leases				207,628
Reserve for Unfunded Commitments				8,344
$ Increase (decrease)				$ 53,237
% Increase (decrease)				33.00%
Accounting Standards Update 2016-13 [Member] | Commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans and leases				$ 55,924
Reserve for Unfunded Commitments				4,564
$ Increase (decrease)				$ 9,107
% Increase (decrease)				18.00%
Accounting Standards Update 2016-13 [Member] | Commercial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans and leases				$ 117,829
Reserve for Unfunded Commitments				2,052
$ Increase (decrease)				$ 43,522
% Increase (decrease)				57.00%
Accounting Standards Update 2016-13 [Member] | Residential
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans and leases				$ 26,813
Reserve for Unfunded Commitments				1,416
$ Increase (decrease)				$ 3,366
% Increase (decrease)				14.00%
Accounting Standards Update 2016-13 [Member] | Consumer & Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans and leases				$ 7,062
Reserve for Unfunded Commitments				312
$ Increase (decrease)				$ (2,758)
% Increase (decrease)				(27.00%)
Accounting Standards Update 2016-13 [Member] | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect adjustment	[1]			$ (40,181)

[1] The cumulative effect adjustment relates to the implementation of new accounting guidance for the allowance for credit losses. Refer to Note 1 for discussion of the new accounting guidance.