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Other assets and other liabilities - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets And Other Liabilities [Abstract]
Cash surrender value on bank owned life insurance	$ 71,977	$ 11,357
Prepaid expenses	5,328	4,575
Software	1,147	1,999
Mortgage lending receivable	8,716	10,765
Derivatives	68,938	21,981
Deferred tax asset	16,396	0
FHLB lender risk account receivable	12,729	11,225
Pledged collateral on derivative instruments	57,985	33,616
Other assets	30,900	27,196
Other assets	$ 274,116	$ 122,714

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Deposits With Federal Home Loan Banks

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Mortgage Lending Receivable

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Other assets and other liabilities.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, with jurisdictional netting.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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The amount of cash or securities placed with a broker or counterparty as security for a trading or derivatives securities position which was partially obtained with funds provided by the broker dealer.

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Amount of assets classified as other.

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Carrying amount as of the balance sheet date of expenditures made in advance of when the economic benefit of the cost will be realized, and which will be expensed in future periods with the passage of time or when a triggering event occurs.

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