QuickLinks -- Click here to rapidly navigate through this document

Exhibit 12

        The ratio of earnings to fixed charges as presented on page 12 was calculated using the data presented below.

							CPF Historical Data (1) Year Ended December 31,
				Pro Forma(2) Year Ended December 31, 2002
							2002			2001			2000			1999			1998
				(Dollars in thousands)
Excluding Interest on Deposits
Earnings:
Income before income taxes				$	48,238		$	48,238		$	38,882		$	30,019		$	24,377		$	24,036
Fixed charges					25,518			9,395			13,476			13,823			9,779			9,692
Less: CPBREI preferrred dividends					(2,010	)		(2,010	)		(837	)		(10	)		(10	)		(10	)
CBBI income before taxes					19,740
Pro forma adjustment					(7,097	)
			Total earnings	$	84,389		$	55,623		$	51,521		$	43,832		$	34,146		$	33,718
Fixed charges:
Total interest expense				$	29,483		$	29,483		$	51,421		$	55,559		$	44,418		$	46,705
	Interest included in rental expense				1,143			1,143			1,069			1,482			1,426			1,455
	Less: Interest on deposits				(23,241	)		(23,241	)		(39,851	)		(43,228	)		(36,075	)		(38,478	)
	CBBI interest expense				30,292
CBBI interest included in rental expense					1,654
	Less: CBBI interest on deposits				(18,098	)
	Pro forma adjustment				2,275
	CPBREI preferred dividends (pre-tax equivalent)				2,010			2,010			837			10			10			10
		Total fixed charges		$	25,518		$	9,395		$	13,476		$	13,823		$	9,779		$	9,692
Ratio of earnings to fixed charges					3.31			5.92			3.82			3.17			3.49			3.48
Including Interest on Deposits
Earnings:
Income before income taxes				$	48,238		$	48,238		$	38,882		$	30,019		$	24,377		$	24,036
Fixed charges					66,587			32,636			53,327			57,051			45,854			48,170
Less: CPBREI preferred dividends					(2,010	)		(2,010	)		(837	)		(10	)		(10	)		(10	)
CBBI income before taxes					19,740
Pro forma adjustment					(7,097	)
		Total earnings		$	125,728		$	78,864		$	91,372		$	87,060		$	70,221		$	72,196
Fixed charges:
	Total interest expense			$	29,483		$	29,483		$	51,421		$	55,559		$	44,418		$	46,705
	Interest included in rental expense				1,143			1,143			1,069			1,482			1,426			1,455
	CBBI interest expense				30,292
	CBBI interest included in rental expense				1,654
	Pro forma adjustment				2,275
	CPBREI preferred dividends (pre-tax equivalent)				2,010			2,010			837			10			10			10
		Total fixed charges		$	66,857		$	32,636		$	53,327		$	57,051		$	45,854		$	48,170
Ratio of earnings to fixed charges					1.88			2.42			1.71			1.53			1.53			1.50

(1)

CPF historical data derived from information contained in CPF's Annual Report on Form 10-K for the year ended December 31, 2002 which is incorporated by reference herein.

(2)

Pro Forma data reflects CPF historical data and information contained in CBBI's Annual Report on Form 10-K for the year ended December 31, 2002 which is incorporated by reference herein.

QuickLinks

Exhibit 12