Acquisitions - Schedule of Final Purchase Price of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 17, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 26, 2019
Loans
Goodwill		$ 154,572	$ 151,238	$ 151,238
TCF National Bank
Assets
Cash and due from banks	$ 4,012
Loans
Total loans	212,000
Premises and equipment, net	6,901
Goodwill	3,334
Core deposit intangible	1,630
Total assets purchased	229,536
Deposits
Non–interest bearing	181,403
NOW accounts	303,050
Savings and money market	262,488
Certificates of deposit	99,468
Total deposits	846,409
Interest payable	16
Other liabilities	1,278
Total liabilities assumed	847,703
Net cash received	(618,167)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Commercial Loan	101,327
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Residential Mortgage Loan	56,499
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Consumer Loan	54,212
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Net	212,038
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Interest receivable	519
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	$ 1,102
Salin
Assets
Cash and due from banks					$ 152,745
Investment securities, available for sale					54,319
Loans
Total loans					568,918
Premises and equipment, net					20,425
FRB and FHLB stock					3,571
Goodwill					31,358
Core deposit intangible					19,818
Interest receivable					2,488
Other assets					112,880
Total assets purchased					966,522
Common shares issued					102,722
Cash paid					24,000
Total purchase price					126,722
Deposits
Non–interest bearing					188,744
NOW accounts					207,567
Savings and money market					274,504
Certificates of deposit					70,529
Total deposits					741,344
Borrowings					70,495
Subordinated debentures					18,376
Interest payable					826
Other liabilities					8,759
Total liabilities assumed					839,800
Salin | Residential mortgage
Loans
Total loans					131,008
Salin | Commercial
Loans
Total loans					352,798
Salin | Consumer
Loans
Total loans					$ 85,112