Mergers and Acquisitions - Consideration Transferred, Identifiable Net Assets Acquired and Goodwill Recognized (Details) - USD ($) $ in Thousands	Jul. 19, 2024	Jan. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Liabilities assumed
Goodwill recognized			$ 1,053,556	$ 1,023,762	$ 985,393	$ 985,393	$ 985,393	$ 985,393
Community Financial Group, Inc.
Fair value of consideration transferred
Fair value of Company shares issued		$ 92,385
Cash consideration		771
Total fair value of consideration transferred		93,156
Identifiable assets acquired
Cash and cash equivalents		31,674
Debt securities		187,183
Loans receivable, net of ACL		452,737
Core deposit intangible		16,936
Accrued income and other assets		50,760
Total identifiable assets acquired		739,290
Liabilities assumed
Deposits		616,955
Borrowings		58,500
Accrued expenses and other liabilities		9,048
Total liabilities assumed		684,503
Total identifiable net assets (liabilities)		54,787
Goodwill recognized		$ 38,369
Core deposit intangible, estimated life		10 years
Rocky Mountain Bank
Fair value of consideration transferred
Fair value of Company shares issued	$ 0
Deposit premium paid	25,238
Total fair value of consideration transferred	25,238
Identifiable assets acquired
Cash and cash equivalents	102,019
Debt securities	0
Loans receivable, net of ACL	271,569
Core deposit intangible	9,794
Accrued income and other assets	15,114
Total identifiable assets acquired	398,496
Liabilities assumed
Deposits	396,690
Borrowings	4,305
Accrued expenses and other liabilities	2,057
Total liabilities assumed	403,052
Total identifiable net assets (liabilities)	(4,556)
Goodwill recognized	$ 29,794