Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Cash flows from operating activities
Net income	$ 5,607	$ 3,917
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	120	129
Premium amortization (discount accretion) on investment securities, net	(1,163)	202
Recapture of impairment loss on securities previously recognized in earnings	0	(1)
Fair value adjustment (gain) loss on equity security	(9)	4
Provision for (recapture of) loan credit losses	(38)	5
Recapture of securities credit losses	(27)	(199)
Gain on sale of mortgage loans	(13)	0
Origination of loans held for sale	(515)	(671)
Proceeds from sale of loans	844	0
Changes in assets and liabilities:
Net increase in accrued interest receivable and other assets	(1,717)	(590)
Net increase in accrued interest payable, accrued expenses and other liabilities	20	675
Net cash provided by operating activities	3,109	3,471
Securities available for sale:
Purchases of securities	(288,006)	(7,061)
Proceeds from calls, maturities, and paydowns	170,458	10,688
Securities held to maturity:
Proceeds from calls, maturities and paydowns	5,005	7
Purchase of restricted securities, net	(137)	(123)
Reinvestment of dividends on equity security	(4)	(3)
Net decrease (increase) in loans	11,285	(1,123)
Purchases of premises and equipment	(1,689)	(60)
Net cash (used in) provided by investing activities	(103,088)	2,325
Cash flows from financing activities
Net increase in noninterest-bearing, savings, interest-bearing checking and money market deposits	318,915	24,879
Net decrease in time deposits	(458)	(1,149)
Increase in short-term borrowings	0	0
Proceeds from stock issuance	0	12
Net cash provided by financing activities	318,457	23,742
Net increase in cash and cash equivalents	218,478	29,538
Cash and cash equivalents, beginning of period	410,739	316,767
Cash and cash equivalents, end of period	629,217	346,305
Supplemental disclosures of cash flow information
Cash payments for interest	878	892
Cash payments for taxes	0	0
Supplemental disclosures of noncash investing activities
Fair value adjustment for available for sale securities	$ 1,809	$ 6

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.