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Loans and Allowance - Allowance for Credit Losses and Loan Portfolio by Loan Segment (Details) $ in Thousands	Dec. 31, 2020 USD ($)
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	56,156
Collectively evaluated for impairment	9,180,857
Financing Receivable, Evaluated for Impairment	9,243,174
Loans acquired with deteriorated credit quality
Loan Balances:
Financing Receivable, Evaluated for Impairment	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
Financing Receivable, Evaluated for Impairment	3,507,698
Commercial | Loans acquired with deteriorated credit quality
Loan Balances:
Financing Receivable, Evaluated for Impairment	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
Financing Receivable, Evaluated for Impairment	3,862,997
Commercial Real Estate | Loans acquired with deteriorated credit quality
Loan Balances:
Financing Receivable, Evaluated for Impairment	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
Financing Receivable, Evaluated for Impairment	129,479
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
Financing Receivable, Evaluated for Impairment	1,743,000
Residential | Loans acquired with deteriorated credit quality
Loan Balances:
Financing Receivable, Evaluated for Impairment	$ 0

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