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Bank segment - Loans receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	$ 5,439,346		$ 5,221,204
Less: Deferred fees and discounts	(12,351)		(10,090)
Allowance for credit losses	(69,456)	$ (67,211)	(71,130)	$ (78,252)	$ (91,793)	$ (101,201)
Total loans, net	5,357,539		5,139,984
Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	4,630,231		4,313,934
Real estate | Residential 1-4 family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	2,310,041		2,299,212
Allowance for credit losses	(8,520)	(7,874)	(6,545)	(5,518)	(5,261)	(4,600)
Real estate | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	1,261,389		1,056,982
Allowance for credit losses	(20,900)	(20,176)	(24,696)	(28,708)	(34,345)	(35,607)
Real estate | Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	923,976		835,663
Allowance for credit losses	(6,096)	(5,650)	(5,657)	(5,335)	(5,901)	(6,813)
Real estate | Residential land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	21,535		19,859
Allowance for credit losses	(677)	(697)	(646)	(618)	(573)	(609)
Real estate | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	94,060		91,080
Allowance for credit losses	(2,634)	(2,340)	(2,186)	(1,629)	(1,453)	(4,149)
Real estate | Residential construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	19,230		11,138
Allowance for credit losses	(46)	(31)	(18)	(16)	(16)	(11)
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	660,478		793,304
Allowance for credit losses	(12,413)	(14,314)	(15,798)	(20,058)	(24,504)	(25,462)
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans	148,637		113,966
Allowance for credit losses	$ (18,170)	$ (16,129)	$ (15,584)	$ (16,370)	$ (19,740)	$ (23,950)

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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

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