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Off-balance Sheet Arrangements, Commitments and Contingencies - Summary of Future Cash Payments Associated with Contractual Obligations Pursuant to Bank Term Funding Program (Details) - Guarantee Obligations [Member] $ in Thousands	Dec. 31, 2024 USD ($)
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	$ 2,730,004
More than 1 year but less than 3 years	1,014,754
3 years or more but less than 5 years	103,516
5 years or more	1,273,153
Total	5,121,427
FHLB advances [Member] | Payment Guarantee [Member]
Contractual Obligations And Off Balance Sheet Items [Line Items]
1 year or less	3,200,000
Total	$ 3,200,000

X

- Definition

Contractual obligations and off balance sheet items.

+ References

No definition available.

+ Details

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Namespace Prefix:	pb_
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Balance Type:	na
Period Type:	duration

X

- Definition

Amount of contractual obligation, including, but not limited to, long-term debt, lease obligation, purchase obligation, and other commitments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

+ Details

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X

- Definition

Amount of contractual obligation to be paid after fifth 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).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in fourth and fifth fiscal years following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in next 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).

+ References

No definition available.

+ Details

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- Definition

Amount of contractual obligation to be paid in second and third fiscal years following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

No definition available.

+ Details

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- Details

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- Details

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