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Bank segment - Loans receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	$ 5,199,026		$ 5,345,226
Less: Deferred fees and discounts	(14,567)		(11,383)
Allowance for credit losses	(78,252)	$ (91,793)	(101,201)	$ (81,307)	$ (77,084)	$ (53,355)
Total loans, net	5,106,207		5,232,642
Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	4,209,835		4,239,745
Real estate | Residential 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	2,122,873		2,144,239
Allowance for credit losses	(5,518)	(5,261)	(4,600)	(3,911)	(4,476)	(2,380)
Real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	1,071,716		983,865
Allowance for credit losses	(28,708)	(34,345)	(35,607)	(21,100)	(16,587)	(15,053)
Real estate | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	870,182		963,578
Allowance for credit losses	(5,335)	(5,901)	(6,813)	(6,214)	(6,225)	(6,922)
Real estate | Residential land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	18,865		15,617
Allowance for credit losses	(618)	(573)	(609)	(356)	(352)	(449)
Real estate | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	115,625		121,424
Allowance for credit losses	(1,629)	(1,453)	(4,149)	(4,757)	(3,446)	(2,097)
Real estate | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	10,574		11,022
Allowance for credit losses	(16)	(16)	(11)	(14)	(14)	(3)
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	856,336		936,748
Allowance for credit losses	(20,058)	(24,504)	(25,462)	(13,868)	(12,977)	(10,245)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, gross	132,855		168,733
Allowance for credit losses	$ (16,370)	$ (19,740)	$ (23,950)	$ (31,087)	$ (33,007)	$ (16,206)

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Amount excluding accrued interest, of allowance for credit loss on financing receivable.

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-Publisher FASB
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Amount, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Amount of unamortized loan commitment, origination, and other fees (costs) and purchase premium (discount) on financing receivable. Excludes financing receivable covered under loss sharing agreement.

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