Allowance for Credit Losses (Summary of Allowance for Credit Losses) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2020
Receivables [Abstract]
Financing receivable, allowance for credit loss, expected, COVID-19	$ 0
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	224,314,000	$ 225,141,000	$ 223,712,000
Provisions	(36,835,000)	58,352,000	31,441,000
Initial PCD allowance		1,193,000
Charge-offs	(35,422,000)	(45,105,000)	(43,027,000)
Recoveries	26,436,000	22,657,000	13,015,000
Ending balance	178,493,000	224,314,000	225,141,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	178,493,000	$ 224,314,000	225,141,000
Allowance for credit loss, forecast period		2 years
PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	23,987,000	$ 7,536,000	9,144,000
Provisions	(14,329,000)	(7,202,000)	(1,608,000)
Initial PCD allowance		1,193,000
Charge-offs	(2,317,000)	(3,300,000)	0
Recoveries	7,461,000	6,759,000	0
Ending balance	14,802,000	23,987,000	7,536,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	14,802,000	23,987,000	7,536,000
Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		(37,924,000)
Ending balance			(37,924,000)
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss			(37,924,000)	$ 37,900,000
Cumulative Effect, Period of Adoption, Adjustment | Financial Asset Acquired and No Credit Deterioration
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss				56,900,000
Cumulative Effect, Period of Adoption, Adjustment | PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		19,001,000
Ending balance			19,001,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss			19,001,000	$ 19,000,000
Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		187,217,000
Ending balance			187,217,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss			187,217,000
Cumulative Effect, Period of Adoption, Adjusted Balance | PCD Loans
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		26,537,000
Ending balance			26,537,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss			26,537,000
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	80,842,000	142,369,000	139,043,000
Provisions	(1,228,000)	37,763,000	13,386,000
Initial PCD allowance		0
Charge-offs	(15,924,000)	(17,586,000)	(14,744,000)
Recoveries	7,523,000	5,850,000	4,684,000
Ending balance	71,213,000	80,842,000	142,369,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	71,213,000	80,842,000	142,369,000
Commercial | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		(87,554,000)
Ending balance			(87,554,000)
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss			(87,554,000)
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		54,815,000
Ending balance			54,815,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss			54,815,000
Consumer Portfolio Segment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	119,485,000	75,236,000	75,525,000
Provisions	(21,278,000)	27,791,000	19,663,000
Initial PCD allowance		0
Charge-offs	(17,181,000)	(24,219,000)	(28,283,000)
Recoveries	11,452,000	10,048,000	8,331,000
Ending balance	92,478,000	119,485,000	75,236,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	92,478,000	119,485,000	75,236,000
Consumer Portfolio Segment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		30,629,000
Ending balance			30,629,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss			30,629,000
Consumer Portfolio Segment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance		105,865,000
Ending balance			105,865,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss			105,865,000
Unfunded Loan Commitment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	12,814,000	1,055,000
Provisions	(999,000)	2,874,000
Ending balance	11,815,000	12,814,000	1,055,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss	11,815,000	12,814,000	1,055,000
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjustment
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	8,885,000
Ending balance		0	8,885,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss		0	8,885,000
Unfunded Loan Commitment | Cumulative Effect, Period of Adoption, Adjusted Balance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 12,814,000	9,940,000
Ending balance		12,814,000	9,940,000
Allowance for Loans and Leases Evaluated for Impairment [Abstract]
Increase (decrease) in allowance for credit loss		$ 12,814,000	$ 9,940,000