Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Interest Income
Interest and fees on loans	$ 58,097	$ 49,195
Interest on investment securities:
Taxable	2,307us-gaap_InterestIncomeSecuritiesTaxable	2,383us-gaap_InterestIncomeSecuritiesTaxable
Tax-exempt	1,906	1,704
Dividends on nonmarketable equity securities	198us-gaap_OtherInterestAndDividendIncome	238us-gaap_OtherInterestAndDividendIncome
Interest on deposits with the Federal Reserve Bank and other banks	122	125
Total interest income	62,630	53,645
Interest Expense
Interest on deposits	3,352us-gaap_InterestExpenseDeposits	3,745us-gaap_InterestExpenseDeposits
Interest on short-term borrowings	98	121
Total interest expense	3,450us-gaap_InterestExpense	3,866us-gaap_InterestExpense
Net Interest Income	59,180us-gaap_InterestIncomeExpenseNet	49,779us-gaap_InterestIncomeExpenseNet
Provision for loan losses	1,500us-gaap_ProvisionForLoanAndLeaseLosses	1,600us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan losses	57,680	48,179
Noninterest Income
Service charges and fees on deposit accounts	5,916	4,930
Wealth management revenue	5,071	3,631
Other charges and fees for customer services	5,990us-gaap_FeesAndCommissionsOther	4,194us-gaap_FeesAndCommissionsOther
Mortgage banking revenue	1,403	794
Gain on sale of investment securities	579us-gaap_GainLossOnSaleOfSecuritiesNet	0us-gaap_GainLossOnSaleOfSecuritiesNet
Other	316us-gaap_NoninterestIncomeOther	167us-gaap_NoninterestIncomeOther
Total noninterest income	19,275us-gaap_NoninterestIncome	13,716us-gaap_NoninterestIncome
Operating Expenses
Salaries, wages and employee benefits	29,268us-gaap_LaborAndRelatedExpense	24,184us-gaap_LaborAndRelatedExpense
Occupancy	4,426us-gaap_OccupancyNet	4,374us-gaap_OccupancyNet
Equipment and software	4,738chfc_EquipmentAndSoftwareExpense	3,461chfc_EquipmentAndSoftwareExpense
Other	12,588us-gaap_OtherNoninterestExpense	10,163us-gaap_OtherNoninterestExpense
Total operating expenses	51,020us-gaap_NoninterestExpense	42,182us-gaap_NoninterestExpense
Income before income taxes	25,935	19,713
Federal income tax expense	8,100us-gaap_IncomeTaxExpenseBenefit	5,900us-gaap_IncomeTaxExpenseBenefit
Net Income	$ 17,835us-gaap_NetIncomeLoss	$ 13,813us-gaap_NetIncomeLoss
Net Income Per Common Share:
Basic (in dollars per share)	$ 0.54us-gaap_EarningsPerShareBasic	$ 0.46us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.54us-gaap_EarningsPerShareDiluted	$ 0.46us-gaap_EarningsPerShareDiluted
Cash Dividends Declared Per Common Share (dollars per share)	$ 0.24	$ 0.23

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- Definition

Other noninterest expenses that are not separately presented in any other noninterest expense category.

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

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