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Allowance for Credit and Loan Losses - Allowance for Credit Loss and Recorded Investment in Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Ending allowance balance attributable to loans:
Total ending allowance balance	$ 57,027	$ 17,667	$ 17,820	$ 16,394
Loans:
Loans acquired with deteriorated credit quality	$ 3,810,356
Recorded Investment, Total		7,351
Loans
Loans:
Individually evaluated for impairment		7,347
Collectively evaluated for impairment		3,627,249
Loans acquired with deteriorated credit quality		0
Recorded Investment, Total		3,634,596
Allowance For Loan Losses
Ending allowance balance attributable to loans:
Individually evaluated for impairment		541
Collectively evaluated for impairment		17,126
Total ending allowance balance		17,667
Mortgage warehouse | Loans
Loans:
Individually evaluated for impairment		0
Collectively evaluated for impairment		150,293
Loans acquired with deteriorated credit quality		0
Recorded Investment, Total		150,293
Mortgage warehouse | Allowance For Loan Losses
Ending allowance balance attributable to loans:
Individually evaluated for impairment		0
Collectively evaluated for impairment		1,077
Total ending allowance balance		1,077
Commercial | Loans
Loans:
Individually evaluated for impairment		7,347
Collectively evaluated for impairment		2,040,299
Loans acquired with deteriorated credit quality		0
Recorded Investment, Total		2,047,646
Commercial | Allowance For Loan Losses
Ending allowance balance attributable to loans:
Individually evaluated for impairment		541
Collectively evaluated for impairment		11,455
Total ending allowance balance		11,996
Real estate | Loans
Loans:
Individually evaluated for impairment		0
Collectively evaluated for impairment		770,705
Loans acquired with deteriorated credit quality		0
Recorded Investment, Total		770,705
Real estate | Allowance For Loan Losses
Ending allowance balance attributable to loans:
Individually evaluated for impairment		0
Collectively evaluated for impairment		923
Total ending allowance balance		923
Consumer | Loans
Loans:
Individually evaluated for impairment		0
Collectively evaluated for impairment		665,952
Loans acquired with deteriorated credit quality		0
Recorded Investment, Total		665,952
Consumer | Allowance For Loan Losses
Ending allowance balance attributable to loans:
Individually evaluated for impairment		0
Collectively evaluated for impairment		3,671
Total ending allowance balance		$ 3,671

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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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