Allowance for Credit Losses - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, collectively evaluated for impairment	$ 5,954,950,000	$ 5,979,260,000
Financing receivable, allowance for credit losses, collectively evaluated for impairment	53,796,000	69,769,000
Financing receivable, individually evaluated for impairment and acquired with deteriorated credit quality	21,200,000
Financing receivable, allowance for credit losses, individually evaluated for impairment and acquired with deteriorated credit quality	4,300,000
Accrued interest receivable on loans	13,900,000	16,100,000
Financing receivable, allowance for credit loss, excluding accrued interest	$ 58,047,000	$ 71,124,000	$ 40,003,000
Financing receivable, allowance for credit loss, excluding accrued interest, loan percentage	0.97%	1.18%
Investment securities, available for sale, allowance	$ 83,000	$ 2,000
Investment securities held to maturity, allowance	181,000	0
Debt securities, available-for-sale, allowance for credit loss, period increase (decrease)	84,000	2,000
Debt securities, held-to-maturity, credit loss expense (reversal)	178,000	(30,000)
Debt securities, accrued interest after allowance for credit loss	5,300,000	3,300,000
Off-balance sheet, credit loss, liability	2,300,000	2,600,000
Off-balance sheet, credit loss, liability, credit loss expense (reversal)	$ (243,000)	$ 1,300,000
Cumulated adjustment for adoption of ASU
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, allowance for credit loss, excluding accrued interest			6,656,000
Debt securities, allowance for credit loss			30,000
Off-balance sheet, credit loss, liability			$ (498,000)