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Fair value measurements - Assets and liabilities measured on a recurring basis (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivative assets
Available-for-sale investment securities	$ 2,305,257
Fair value measurements on a recurring basis | Level 1
Derivative liabilities
Derivative liabilities	0	$ 500
Fair value measurements on a recurring basis | Level 1 | Bank
Derivative assets
Available-for-sale investment securities	0	0
Derivative assets	340	0
Fair value measurements on a recurring basis | Level 1 | Bank | Interest rate lock commitments
Derivative assets
Derivative assets	0	0
Derivative liabilities
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 1 | Bank | Forward commitments
Derivative assets
Derivative assets	340	0
Derivative liabilities
Derivative liabilities	0	500
Fair value measurements on a recurring basis | Level 1 | Other | Interest rate swap
Derivative assets
Derivative assets	0	0
Derivative liabilities
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 1 | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | Bank
Derivative assets
Available-for-sale investment securities	0	0
Fair value measurements on a recurring basis | Level 1 | U.S. Treasury and federal agency obligations | Bank
Derivative assets
Available-for-sale investment securities	0	0
Fair value measurements on a recurring basis | Level 1 | Corporate bonds | Bank
Derivative assets
Available-for-sale investment securities	0	0
Fair value measurements on a recurring basis | Level 1 | Mortgage revenue bonds | Bank
Derivative assets
Available-for-sale investment securities	0	0
Fair value measurements on a recurring basis | Level 2
Derivative liabilities
Derivative liabilities	2,834	4,530
Fair value measurements on a recurring basis | Level 2 | Bank
Derivative assets
Available-for-sale investment securities	2,289,830	1,943,232
Derivative assets	745	4,536
Fair value measurements on a recurring basis | Level 2 | Bank | Interest rate lock commitments
Derivative assets
Derivative assets	456	4,536
Derivative liabilities
Derivative liabilities	18	0
Fair value measurements on a recurring basis | Level 2 | Bank | Forward commitments
Derivative assets
Derivative assets	0	0
Derivative liabilities
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 2 | Other | Interest rate swap
Derivative assets
Derivative assets	289	0
Derivative liabilities
Derivative liabilities	2,816	4,530
Fair value measurements on a recurring basis | Level 2 | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | Bank
Derivative assets
Available-for-sale investment securities	2,201,352	1,849,559
Fair value measurements on a recurring basis | Level 2 | U.S. Treasury and federal agency obligations | Bank
Derivative assets
Available-for-sale investment securities	57,647	62,322
Fair value measurements on a recurring basis | Level 2 | Corporate bonds | Bank
Derivative assets
Available-for-sale investment securities	30,831	31,351
Fair value measurements on a recurring basis | Level 2 | Mortgage revenue bonds | Bank
Derivative assets
Available-for-sale investment securities	0	0
Fair value measurements on a recurring basis | Level 3
Derivative liabilities
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 3 | Bank
Derivative assets
Available-for-sale investment securities	15,427	27,185
Derivative assets	0	0
Fair value measurements on a recurring basis | Level 3 | Bank | Interest rate lock commitments
Derivative assets
Derivative assets	0	0
Derivative liabilities
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 3 | Bank | Forward commitments
Derivative assets
Derivative assets	0	0
Derivative liabilities
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 3 | Other | Interest rate swap
Derivative assets
Derivative assets	0	0
Derivative liabilities
Derivative liabilities	0	0
Fair value measurements on a recurring basis | Level 3 | Mortgage-backed securities — issued or guaranteed by U.S. Government agencies or sponsored agencies | Bank
Derivative assets
Available-for-sale investment securities	0	0
Fair value measurements on a recurring basis | Level 3 | U.S. Treasury and federal agency obligations | Bank
Derivative assets
Available-for-sale investment securities	0	0
Fair value measurements on a recurring basis | Level 3 | Corporate bonds | Bank
Derivative assets
Available-for-sale investment securities	0	0
Fair value measurements on a recurring basis | Level 3 | Mortgage revenue bonds | Bank
Derivative assets
Available-for-sale investment securities	$ 15,427	$ 27,185

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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