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Fair value measurements - Fair Value Measurements on a Recurring Basis (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities $ 1,136,439 $ 1,429,667
Measurement Input, Discount Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Mortgage revenue bonds, measurement input 0.0567  
Mortgage revenue bonds    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance, January 1 $ 14,902 15,427
Principal payments received (544) (525)
Purchases 0
Unrealized gain (loss) included in other comprehensive income 0 0
Balance, December 31 14,358 14,902
Level 1 | Fair value measurements on a recurring basis    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 0 18
Derivative liabilities 18 0
Level 1 | Fair value measurements on a recurring basis | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 0 0
Level 1 | Fair value measurements on a recurring basis | Bank | Interest rate lock commitments    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 0 0
Level 1 | Fair value measurements on a recurring basis | Bank | Forward commitments    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 0 18
Derivative liabilities 18 0
Level 1 | Fair value measurements on a recurring basis | Bank | Interest rate swap    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 0 0
Level 1 | Fair value measurements on a recurring basis | Other | Interest rate swap    
Fair value measurements on a recurring and nonrecurring basis    
Derivative liabilities 0 0
Level 1 | Fair value measurements on a recurring basis | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 0 0
Level 1 | Fair value measurements on a recurring basis | U.S. Treasury and federal agency obligations | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 0 0
Level 1 | Fair value measurements on a recurring basis | Corporate bonds | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 0 0
Level 1 | Fair value measurements on a recurring basis | Mortgage revenue bonds | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 0 0
Level 2 | Fair value measurements on a recurring basis    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 1,058 1,330
Derivative liabilities 303 472
Level 2 | Fair value measurements on a recurring basis | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 1,122,081 1,414,765
Level 2 | Fair value measurements on a recurring basis | Bank | Interest rate lock commitments    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 86 9
Level 2 | Fair value measurements on a recurring basis | Bank | Forward commitments    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 0 0
Derivative liabilities 0 0
Level 2 | Fair value measurements on a recurring basis | Bank | Interest rate swap    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 972 1,321
Level 2 | Fair value measurements on a recurring basis | Other | Interest rate swap    
Fair value measurements on a recurring and nonrecurring basis    
Derivative liabilities 303 472
Level 2 | Fair value measurements on a recurring basis | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 1,077,168 1,292,968
Level 2 | Fair value measurements on a recurring basis | U.S. Treasury and federal agency obligations | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 12,010 81,063
Level 2 | Fair value measurements on a recurring basis | Corporate bonds | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 32,903 40,734
Level 2 | Fair value measurements on a recurring basis | Mortgage revenue bonds | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 0 0
Level 3 | Fair value measurements on a recurring basis    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 0 0
Derivative liabilities 0 0
Level 3 | Fair value measurements on a recurring basis | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 14,358 14,902
Level 3 | Fair value measurements on a recurring basis | Bank | Interest rate lock commitments    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 0 0
Level 3 | Fair value measurements on a recurring basis | Bank | Forward commitments    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 0 0
Derivative liabilities 0 0
Level 3 | Fair value measurements on a recurring basis | Bank | Interest rate swap    
Fair value measurements on a recurring and nonrecurring basis    
Derivative assets 0 0
Level 3 | Fair value measurements on a recurring basis | Other | Interest rate swap    
Fair value measurements on a recurring and nonrecurring basis    
Derivative liabilities 0 0
Level 3 | Fair value measurements on a recurring basis | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 0 0
Level 3 | Fair value measurements on a recurring basis | U.S. Treasury and federal agency obligations | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 0 0
Level 3 | Fair value measurements on a recurring basis | Corporate bonds | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities 0 0
Level 3 | Fair value measurements on a recurring basis | Mortgage revenue bonds | Bank    
Fair value measurements on a recurring and nonrecurring basis    
Available-for-sale investment securities $ 14,358 $ 14,902