Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024
Cash flows from operating activities
Net income	$ 14,893	$ 17,209
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	354	372
Premium discount accretion on investment securities, net	(2,927)	(325)
Recapture of impairment loss on securities previously recognized in earnings	(2)	(3)
Fair value adjustment gain on equity security	(14)	(11)
Recapture of loan credit losses	(404)	(113)
Recapture of securities credit losses	(69)	(297)
Loss on sale of securities	0	65
Gain on sale of mortgage loans	(55)	(25)
Origination of loans held for sale	(3,538)	(2,537)
Proceeds from sale of loans	3,909	2,562
Changes in assets and liabilities:
Net increase in accrued interest receivable and other assets	(2,684)	(1,211)
Net increase (decrease) in accrued interest payable, accrued expenses and other liabilities	(224)	1,831
Net cash provided by operating activities	9,239	17,517
Securities available for sale:
Purchases of securities	(498,213)	(111,508)
Proceeds from sales, calls, maturities, and paydowns	316,911	80,964
Securities held to maturity:
Proceeds from sales, calls, maturities and paydowns	16,539	5,471
Purchase of restricted securities, net	(497)	(273)
Reinvestment of dividends on equity security	(12)	(11)
Net decrease in loans	29,203	4,112
Purchases of premises and equipment	(2,831)	(127)
Net cash used in investing activities	(138,900)	(21,372)
Cash flows from financing activities
Net increase in noninterest-bearing, savings, interest-bearing checking and money market deposits	116,894	326,716
Net decrease in time deposits	(2,289)	(4,873)
Increase in short-term borrowings	0	5,000
Proceeds from stock issuance	0	12
Net cash provided by financing activities	114,605	326,855
Net increase (decrease) in cash and cash equivalents	(15,056)	323,000
Cash and cash equivalents, beginning of period	410,739	316,767
Cash and cash equivalents, end of period	395,683	639,767
Supplemental disclosures of cash flow information
Cash payments for interest	3,042	2,882
Cash payments for taxes	3,545	2,551
Supplemental disclosures of noncash investing activities
Fair value adjustment for available for sale securities	$ 4,171	$ 4,439

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.