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Commitments and Contingencies - Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating leases:
Operating lease right-of-use assets	$ 24,776	$ 25,612
Operating lease liabilities	$ 26,637	$ 27,062
Finance leases:
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Bank premises and equipment, net	Bank premises and equipment, net
Finance lease right-of-use assets	$ 499	$ 365
Accumulated amortization	(62)	(307)
Finance lease right-of-use assets, net	437	58
Finance lease liabilities	$ 451	$ 58

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Finance Leases [Abstract]

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Present value of lessee's discounted obligation for lease payments from finance lease.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
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Amount, after accumulated amortization, of right-of-use asset from finance lease.

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Indicates line item in statement of financial position that includes finance lease right-of-use asset.

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Amount of lessee's right to use underlying asset under operating lease.

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