Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Cash flows from operating activities
Net income	$ 20,949	$ 8,831
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	494	491
Premium amortization (discount accretion) on investment securities, net	(506)	1,616
Recapture of impairment loss on securities previously recognized in earnings	(3)	(13)
Fair value loss (gain) on equity security	5	(7)
Provision for (recapture of) loan credit losses	195	(163)
Provision for (recapture of) securities credit losses	(356)	804
Loss on sale of securities	81	389
Gain on sale of mortgage loans	(27)	(12)
Origination of loans held for sale	(3,095)	(1,305)
Proceeds from sale of loans	2,806	1,317
Deferred income tax benefit	(157)	(99)
Changes in assets and liabilities:
Net (increase) decrease in accrued interest receivable and other assets	(792)	170
Net increase in accrued interest payable, accrued expenses and other liabilities	2,203	793
Net cash provided by operating activities	21,797	12,812
Securities available for sale:
Purchases of securities	(282,586)	(23,138)
Proceeds from sales, calls, maturities, recoveries, and paydowns	187,614	50,750
Securities held to maturity:
Purchases of securities	0	(263)
Proceeds from sales, calls, maturities and paydowns	7,351	3,216
Purchase of restricted securities, net	(273)	(112)
Reinvestment of dividends on equity security	(15)	(12)
Net (increase) decrease in loans	(9,143)	16,049
Purchases of premises and equipment	(223)	(269)
Net cash provided by (used in) by investing activities	(97,275)	46,221
Cash flows from financing activities
Net increase in noninterest-bearing, savings, interest-bearing checking and money market deposits	142,941	154,902
Net increase (decrease) in time deposits	(5,031)	4,169
Repayment of short-term borrowings	(5,000)	0
Net proceeds from stock issuance	36,540	0
Net cash provided by financing activities	169,450	159,071
Net increase in cash and cash equivalents	93,972	218,104
Cash and cash equivalents, beginning of period	316,767	98,663
Cash and cash equivalents, end of period	410,739	316,767
Supplemental disclosures of cash flow information
Cash payments for interest	3,718	4,005
Cash payments for taxes	6,411	2,047
Supplemental disclosures of noncash investing activities
Net securities loss reclassified into earnings	$ 3,044	$ 6,587

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.