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Allowance for Credit Losses (ACL) - Aggregated analysis of the changes in allowance for loan losses Summary (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for credit losses
Balance at beginning of period	$ 56,927
Loans charged-off	(14,602)
Recoveries of loans previously charged off	11,777
Net charge-offs	(2,825)
Provision for loan losses charged to operations	89,923
Balance at end of period	457,309	$ 56,927
Previous Accounting Guidance [Member]
Allowance for credit losses
Balance at beginning of period	61,991	55,798	$ 48,075
Loans charged-off		(9,775)	(8,226)
Recoveries of loans previously charged off		3,914	3,300
Net charge-offs		(5,861)	(4,926)
Provision for loan losses charged to operations		12,777	13,783
Reduction due to loan removals		(723)	(1,134)
Balance at end of period		61,991	55,798
Non-acquired loans
Allowance for credit losses
Balance at beginning of period	56,927	51,194	43,448
Loans charged-off		(6,917)	(6,012)
Recoveries of loans previously charged off		3,367	2,995
Provision for loan losses charged to operations		9,283	10,763
Balance at end of period		56,927	51,194
Non-acquired loans | Previous Accounting Guidance [Member]
Allowance for credit losses
Balance at beginning of period	56,927	51,194	43,448
Loans charged-off		(6,917)	(6,012)
Recoveries of loans previously charged off		3,367	2,995
Net charge-offs		(3,550)	(3,017)
Provision for loan losses charged to operations		9,283	10,763
Balance at end of period		56,927	51,194
Acquired non-credit impaired loans
Allowance for credit losses
Loans charged-off		(2,858)	(2,214)
Recoveries of loans previously charged off		547	305
Provision for loan losses charged to operations		2,311	1,909
Acquired non-credit impaired loans | Previous Accounting Guidance [Member]
Allowance for credit losses
Loans charged-off		(2,858)	(2,214)
Recoveries of loans previously charged off		547	305
Net charge-offs		(2,311)	(1,909)
Provision for loan losses charged to operations		2,311	1,909
Acquired credit impaired loans
Allowance for credit losses
Balance at beginning of period	5,064	4,604	4,627
Provision for loan losses charged to operations		1,183	1,111
Balance at end of period		5,064	4,604
Acquired credit impaired loans | Previous Accounting Guidance [Member]
Allowance for credit losses
Balance at beginning of period	$ 5,064	4,604	4,627
Provision for loan losses charged to operations		1,183	1,111
Reduction due to loan removals		(723)	(1,134)
Balance at end of period		$ 5,064	$ 4,604

X

- Definition

Reflects the amount of loans and leases that have been removed, or charged off, from both loan receivables and the reserve for credit losses, typically because they are considered to be not salvageable or have been purchased by unconsolidated collection entities. This amount is net of reduction in bad debt expense attributable to collections of loans and lease receivables which had previously been fully or partially charged off as bad debts.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase (decrease) in allowance for credit loss on financing receivable.

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Amount of increase in allowance for credit loss on financing receivable from recovery.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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