Investments - Investments by contractual maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Apr. 01, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities
Within one year, amortized cost	$ 0
Within one year, estimated fair value	0
After one year through five years, amortized cost	0
After one year through five years, estimated fair value	0
After five years through ten years, amortized cost	43,688
After five years through ten years, estimated fair value	38,328
After ten years, amortized cost	187,051
After ten years, estimated fair value	164,032
Total securities with single maturity date, amortized cost	230,739
Total securities with single maturity date, estimated fair value	202,360
Debt securities, amortized cost	790,492		$ 1,098,373
Available-for-sale debt securities	710,481		1,109,208
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Fair Value	0
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	0
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	0
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year One through Five	0
Debt Securities, Held-to-maturity, Maturity, Rolling after Five Through Ten Years, Weighted Average Yield	42,868
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	40,540
Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	134,774
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date, after Year 10	149,083
Held-to-maturity investment securities	175,314
Held-to-maturity investment securities	191,951	$ 306,700
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	305,902		0
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	284,262
U.S. Government agencies
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	352
Investment securities not due at a single maturity date, estimated fair value	333
Debt securities, amortized cost	352		373
Available-for-sale debt securities	333		379
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	128,996
Investment securities not due at a single maturity date, estimated fair value	122,452
Debt securities, amortized cost	128,996		213,471
Available-for-sale debt securities	122,452		214,439
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	10,269
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	9,517
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Investment securities not due at a single maturity date, amortized cost	430,405
Investment securities not due at a single maturity date, estimated fair value	385,336
Debt securities, amortized cost	430,405		317,089
Available-for-sale debt securities	385,336		313,220
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	57,750
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	54,431
Corporate debt securities
Schedule of Available-for-sale Securities
Debt securities, amortized cost			44,500
Available-for-sale debt securities			$ 44,778
Debt Securities, Held-to-Maturity, Amortized Cost, after Allowance for Credit Loss, Maturity, without Single Maturity Date	45,932
Debt Securities, Held-to-maturity, Maturity, without Single Maturity Date, Fair Value	$ 45,000

Available-for-sale Securities, Debt Maturities, with Single Maturity Date, Amortized Cost Basis

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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing after tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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No definition available.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in sixth through tenth rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

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No definition available.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), without single maturity date and not allocated over maturity grouping.

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Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) without single maturity date and not allocated over maturity grouping.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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