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Loans and Allowance - Narrative (Details) loan in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Receivables [Abstract]
Loans held for sale	$ 901		$ 901			$ 9,037
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of funded loans | loan			5
Loans	9,298,541		$ 9,298,541			8,459,310
Loans - allowance for loan losses	121,119	$ 81,274	121,119	$ 81,274	$ 99,454	80,284	$ 80,902	$ 80,552
Increase in past due loans			25,100
PPP, CARES Act
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans net of deferred fees	882,900		882,900
Deferred fees	24,600		24,600
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,677,501		1,677,501			1,732,201
Loans - allowance for loan losses	$ 21,078	$ 14,471	$ 21,078	$ 14,471	$ 17,364	14,569	$ 14,373	$ 14,322
Percentage of troubled debt restructured loans	42.00%	100.00%	42.00%	100.00%
Mortgage loans with formal foreclosure proceedings	$ 492		$ 492			1,033
Loans acquired with deteriorated credit quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	8,281		8,281			13,309
Loans acquired with deteriorated credit quality | Commercial and consumer loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,783		3,783			2,819
Loans - allowance for loan losses	192		192			124
Loans acquired with deteriorated credit quality | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	955		955			$ 1,715
Four relationships
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in past due loans			28,600
Three relationships
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in non-accrual loans			34,200
Three relationships | Real estate secured loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in past due loans			$ 17,800
Increase in non-accrual loans, percent of total			69.00%
Two relationships | Senior living sector
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in non-accrual loans			$ 17,000
One relationships | University logo apparel sports
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in non-accrual loans			14,400
PPPL Facility
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 166,900		$ 166,900

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