Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025
Cash flows from operating activities
Net income	$ 16,584	$ 10,191
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	300	238
Discount accretion on investment securities, net	(1,642)	(2,107)
Recapture of impairment loss on securities previously recognized in earnings	(2)	(1)
Fair value adjustment (gain) loss on equity security	6	(9)
Recapture of loan credit losses	(382)	(321)
Recapture of securities credit losses	(37)	(58)
Gain on sale of mortgage loans	(3)	(27)
Origination of loans held for sale	(190)	(1,726)
Proceeds from sale of loans	193	2,068
Deferred income tax expense	1	0
Changes in assets and liabilities:
Net increase in accrued interest receivable and other assets	(1,752)	(1,110)
Net decrease in accrued interest payable, accrued expenses and other liabilities	(462)	(679)
Net cash provided by operating activities	12,614	6,459
Securities available for sale:
Purchases of securities	(356,531)	(354,124)
Proceeds from calls, maturities, and paydowns	122,030	248,586
Securities held to maturity:
Proceeds from calls, maturities and paydowns	32,206	11,165
Purchase of restricted securities, net	(376)	(497)
Reinvestment of dividends on equity security	(8)	(8)
Net decrease in loans	474	25,474
Purchases of premises and equipment	(3,462)	(2,509)
Net cash used in investing activities	(205,667)	(71,913)
Cash flows from financing activities
Net increase in noninterest-bearing, savings, interest-bearing checking and money market deposits	429,943	33,704
Net decrease in time deposits	(1,754)	(1,725)
Net cash provided by financing activities	428,189	31,979
Net increase (decrease) in cash and cash equivalents	235,136	(33,475)
Cash and cash equivalents, beginning of period	586,630	410,739
Cash and cash equivalents, end of period	821,766	377,264
Supplemental disclosures of cash flow information
Cash payments for interest	1,231	1,828
Cash payments for taxes	3,728	2,500
Supplemental disclosures of noncash investing activities
Fair value adjustment for available for sale securities	$ (3,143)	$ 2,614

Recovery Of Impairment Losses Previously Recognized In Earnings

No definition available.

Name:	chnbrdg_RecoveryOfImpairmentLossesPreviouslyRecognizedInEarnings
Namespace Prefix:	chnbrdg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.