CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
ASSETS
Cash and cash equivalents	$ 553,915	$ 1,029,983
Trading securities	46,595	49,518
Securities available-for-sale, at fair value	4,119,215	3,993,385
Securities held-to-maturity, at amortized cost (fair value of $1,120,088 and $1,170,818 at June 30, 2026 and December 31, 2025, respectively)	1,286,813	1,336,632
Loans held for sale (includes $5,345 and $5,967 carried at fair value at June 30, 2026 and December 31, 2025, respectively)	5,345	5,967
Loan receivables	13,576,196	14,176,936
Allowance for credit losses on loans	(152,601)	(153,319)
Net loan receivables	13,423,595	14,023,617
Mortgage servicing rights (includes $58,836 and $58,095 carried at fair value at June 30, 2026 and December 31, 2025, respectively)	59,142	85,832
Other real estate owned	4,262	4,990
Federal Home Loan Bank stock, at cost	17,287	17,292
Premises and equipment, net	141,615	143,895
Bank owned life insurance	172,980	170,339
Goodwill	843,305	843,305
Other intangible assets, net	97,906	212,491
Right-of-use asset	74,623	82,076
Interest receivable and other assets	384,241	352,153
TOTAL ASSETS	21,230,839	22,351,475
LIABILITIES
Noninterest-bearing demand deposits	6,420,746	6,744,082
Interest-bearing transaction accounts	8,394,708	8,128,832
Savings and time deposits	3,273,983	4,152,083
Total deposits	18,089,437	19,024,997
Borrowings	80,000	0
Long-term debt	130,420	192,014
Operating lease liability	78,174	86,794
Interest payable and other liabilities	162,877	185,295
TOTAL LIABILITIES	18,540,908	19,489,100
SHAREHOLDERS’ EQUITY
Common stock, Class A, no par value, Authorized —1,897,500,000 shares, Issued and outstanding, 220,311,021 shares and 220,190,561 shares at June 30, 2026 and December 31, 2025, respectively; Class B, no par value, Authorized — 2,500,000 shares, Issued and outstanding, 1,114,448 shares at June 30, 2026 and December 31, 2025	2,404,941	2,402,193
Retained earnings	303,046	456,695
Accumulated other comprehensive income (loss), net of tax	(18,056)	3,487
TOTAL SHAREHOLDERS’ EQUITY	2,689,931	2,862,375
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 21,230,839	$ 22,351,475

Savings And Time Deposits

No definition available.

Name:	mchb_SavingsAndTimeDeposits
Namespace Prefix:	mchb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.