Allowance for Credit Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) loan	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Financing Receivable, Past Due [Line Items]
Total		$ 7,040,894	$ 6,999,990
Non - performing		31,775	66,291	$ 146,774
Number of modified loans | loan	8
Modified loans	$ 28,800
Current
Financing Receivable, Past Due [Line Items]
Total		7,004,031	6,927,943
Total Past Due Loans
Financing Receivable, Past Due [Line Items]
Total		36,863	72,047
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total		2,647	3,085
60-89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total		2,441	2,671
Commercial Loans
Financing Receivable, Past Due [Line Items]
Total		5,297,126	5,406,584
Commercial Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total		2,626,004	2,690,528
Non - performing		15,022	31,488	101,070
Commercial Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total		1,479,586	1,513,523
Non - performing		342	15,239	16,985
Commercial Loans | Commercial construction
Financing Receivable, Past Due [Line Items]
Total		395,335	424,755
Non - performing		864	2,471	384
Commercial Loans | Business banking
Financing Receivable, Past Due [Line Items]
Total		1,160,790	1,135,693
Non - performing		7,907	9,641	17,122
Commercial Loans | Current | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total		2,610,642	2,659,040
Commercial Loans | Current | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total		1,478,546	1,497,755
Commercial Loans | Current | Commercial construction
Financing Receivable, Past Due [Line Items]
Total		394,471	421,834
Commercial Loans | Current | Business banking
Financing Receivable, Past Due [Line Items]
Total		1,150,781	1,124,748
Commercial Loans | Total Past Due Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total		15,362	31,488
Commercial Loans | Total Past Due Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total		1,040	15,768
Commercial Loans | Total Past Due Loans | Commercial construction
Financing Receivable, Past Due [Line Items]
Total		864	2,921
Commercial Loans | Total Past Due Loans | Business banking
Financing Receivable, Past Due [Line Items]
Total		10,009	10,945
Commercial Loans | 30-59 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total		0	0
Commercial Loans | 30-59 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total		698	529
Commercial Loans | 30-59 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Total		0	450
Commercial Loans | 30-59 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Total		674	813
Commercial Loans | 60-89 Days Past Due | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total		340	0
Commercial Loans | 60-89 Days Past Due | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total		0	0
Commercial Loans | 60-89 Days Past Due | Commercial construction
Financing Receivable, Past Due [Line Items]
Total		0	0
Commercial Loans | 60-89 Days Past Due | Business banking
Financing Receivable, Past Due [Line Items]
Total		1,428	491
Consumer Loans
Financing Receivable, Past Due [Line Items]
Total		1,743,768	1,593,406
Consumer Loans | Business banking
Financing Receivable, Past Due [Line Items]
Total			357,900
Consumer Loans | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total		1,259,252	1,127,585
Non - performing		7,384	7,294	11,117
Consumer Loans | Other Consumer
Financing Receivable, Past Due [Line Items]
Total		119,927	107,906
Non - performing		256	158	$ 96
Consumer Loans | Current | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total		1,250,221	1,117,074
Consumer Loans | Current | Other Consumer
Financing Receivable, Past Due [Line Items]
Total		119,370	107,492
Consumer Loans | Total Past Due Loans | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total		9,031	10,511
Consumer Loans | Total Past Due Loans | Other Consumer
Financing Receivable, Past Due [Line Items]
Total		557	414
Consumer Loans | 30-59 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total		1,050	1,087
Consumer Loans | 30-59 Days Past Due | Other Consumer
Financing Receivable, Past Due [Line Items]
Total		225	206
Consumer Loans | 60-89 Days Past Due | Consumer real estate
Financing Receivable, Past Due [Line Items]
Total		597	2,130
Consumer Loans | 60-89 Days Past Due | Other Consumer
Financing Receivable, Past Due [Line Items]
Total		$ 76	$ 50