Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities
Net income	$ 10,191	$ 9,722
Reconciliation of net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	238	251
Premium amortization (discount accretion) on investment securities, net	(2,107)	327
Recapture of impairment loss on securities previously recognized in earnings	(1)	(2)
Fair value adjustment (gain) loss on equity security	(9)	7
Provision for (recapture of) loan credit losses	(321)	18
Recapture of securities credit losses	(58)	(310)
Gain on sale of mortgage loans	(27)	(12)
Origination of loans held for sale	(1,726)	(2,055)
Proceeds from sale of loans	2,068	1,477
Changes in assets and liabilities:
Net increase in accrued interest receivable and other assets	(1,110)	(94)
Net decrease in accrued interest payable, accrued expenses and other liabilities	(679)	(56)
Net cash provided by operating activities	6,459	9,273
Securities available for sale:
Purchases of securities	(354,124)	(61,120)
Proceeds from calls, maturities, and paydowns	248,586	27,565
Securities held to maturity:
Proceeds from calls, maturities and paydowns	11,165	13
Purchase of restricted securities, net	(497)	(123)
Reinvestment of dividends on equity security	(8)	(7)
Net decrease (increase) in loans	25,474	(571)
Purchases of premises and equipment	(2,509)	(99)
Net cash used in investing activities	(71,913)	(34,342)
Cash flows from financing activities
Net increase in noninterest-bearing, savings, interest-bearing checking and money market deposits	33,704	195,986
Net decrease in time deposits	(1,725)	(4,671)
Increase in short-term borrowings	0	5,000
Proceeds from stock issuance	0	12
Net cash provided by financing activities	31,979	196,327
Net increase (decrease) in cash and cash equivalents	(33,475)	171,258
Cash and cash equivalents, beginning of period	410,739	316,767
Cash and cash equivalents, end of period	377,264	488,025
Supplemental disclosures of cash flow information
Cash payments for interest	1,828	1,794
Cash payments for taxes	2,500	543
Supplemental disclosures of noncash investing activities
Fair value adjustment for available for sale securities	$ 2,614	$ 467

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.