Loans and Allowance for Credit Losses - Allowance for Credit Losses and Loan Portfolio by Loan Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Allowance Balances:
Individually evaluated for impairment		$ 12,901
Collectively evaluated for impairment		117,747
Total Allowance for Loan Losses		130,648
Loan Balances:
Individually evaluated for impairment	$ 39,531	56,156
Collectively evaluated for impairment		9,180,857
Loans acquired with deteriorated credit quality		9,243,174
Loans acquired with deteriorated credit quality
Loan Balances:
Loans acquired with deteriorated credit quality		6,161
Commercial
Allowance Balances:
Individually evaluated for impairment		223
Collectively evaluated for impairment		46,892
Total Allowance for Loan Losses		47,115
Loan Balances:
Individually evaluated for impairment		1,258
Collectively evaluated for impairment		3,505,863
Loans acquired with deteriorated credit quality		3,507,698
Commercial | Loans acquired with deteriorated credit quality
Loan Balances:
Loans acquired with deteriorated credit quality		577
Commercial Real Estate
Allowance Balances:
Individually evaluated for impairment		12,246
Collectively evaluated for impairment		38,824
Total Allowance for Loan Losses		51,070
Loan Balances:
Individually evaluated for impairment		51,605
Collectively evaluated for impairment		3,805,808
Loans acquired with deteriorated credit quality		3,862,997
Commercial Real Estate | Loans acquired with deteriorated credit quality
Loan Balances:
Loans acquired with deteriorated credit quality		5,584
Consumer
Allowance Balances:
Individually evaluated for impairment		0
Collectively evaluated for impairment		9,648
Total Allowance for Loan Losses		9,648
Loan Balances:
Individually evaluated for impairment		2
Collectively evaluated for impairment		129,477
Loans acquired with deteriorated credit quality		129,479
Consumer | Loans acquired with deteriorated credit quality
Loan Balances:
Loans acquired with deteriorated credit quality		0
Residential
Allowance Balances:
Individually evaluated for impairment		432
Collectively evaluated for impairment		22,383
Total Allowance for Loan Losses		22,815
Loan Balances:
Individually evaluated for impairment		3,291
Collectively evaluated for impairment		1,739,709
Loans acquired with deteriorated credit quality		1,743,000
Residential | Loans acquired with deteriorated credit quality
Loan Balances:
Loans acquired with deteriorated credit quality		$ 0