Commitments and Contingencies	3 Months Ended
Mar. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies To meet the financing needs of its customers, BancShares and its subsidiaries have financial instruments with off-balance sheet risk. These financial instruments include commitments to extend credit, standby letters of credit and recourse obligations on mortgage loans sold. These instruments involve elements of credit, interest rate or liquidity risk. Commitments to extend credit are legally binding agreements to lend to customers. Commitments generally have fixed expiration dates or other termination clauses and may require payment of fees. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future liquidity requirements. Established credit standards control the credit risk exposure associated with these commitments. In some cases, BancShares requires that collateral be pledged to secure the commitment, including cash deposits, securities and other assets. At March 31, 2014, BancShares had unused commitments totaling $6.11 billion, compared to $5.84 billion at December 31, 2013. Standby letters of credit are commitments guaranteeing performance of a customer to a third party. Those commitments are primarily issued to support public and private borrowing arrangements. To mitigate its risk, BancShares’ follows its credit policies in the issuance of standby letters of credit. At March 31, 2014 and December 31, 2013, BancShares had standby letters of credit amounting to $52.3 million and $54.8 million, respectively. The credit risk related to the issuance of these letters of credit is essentially the same as that involved in extending loans to clients and, therefore, these letters of credit are collateralized when necessary. Pursuant to standard representations and warranties relating to residential mortgage loan sales, contingent obligations exist for various events that may occur following the loan sale. If underwriting or documentation deficiencies are discovered at any point in the life of the loan or if the loan becomes nonperforming within 120 days of its sale, the investor may require BancShares to repurchase the loan or to repay a portion of the sale proceeds. Other liabilities included reserves of $3.6 million as of March 31, 2014, unchanged from December 31, 2013, for estimated losses arising from these standard representation and warranty provisions. BancShares has recorded a receivable from the FDIC totaling $74.8 million and $93.4 million as of March 31, 2014 and December 31, 2013 for the expected reimbursement of losses on assets covered under the various loss share agreements. These loss share agreements impose certain obligations on us that, in the event of noncompliance, could result in the delay or disallowance of some or all of our rights under those agreements. Requests for reimbursement are subject to FDIC review and may be delayed or disallowed for noncompliance. The loss share agreements are subject to interpretation by both the FDIC and FCB, and disagreements may arise regarding coverage of losses, expenses and contingencies. The loss share agreements for four FDIC-assisted transactions include provisions related to contingent payments that may be owed to the FDIC at the termination of the agreements (clawback liability).The clawback liability represents a payment by BancShares to the FDIC if actual cumulative losses on acquired covered assets are lower than the cumulative losses originally estimated by the FDIC at the time of acquisition. The clawback liability is estimated by discounting estimated future payments and is recorded in the Consolidated Balance Sheets as a payable to the FDIC under the relevant loss share agreements. As of March 31, 2014 and December 31, 2013, the estimated clawback liability was $111.3 million and $109.4 million, respectively. BancShares and various subsidiaries have been named as defendants in legal actions arising from their normal business activities in which damages in various amounts are claimed. BancShares is also exposed to litigation risk relating to the prior business activities of banks from which assets were acquired and liabilities assumed in the various FDIC-assisted transactions. Although the amount of any ultimate liability with respect to such matters cannot be determined, in the opinion of management, any such liability will not have a material effect on BancShares’ consolidated financial statements.

Commitments and Contingencies

To meet the financing needs of its customers, BancShares and its subsidiaries have financial instruments with off-balance sheet risk. These financial instruments include commitments to extend credit, standby letters of credit and recourse obligations on mortgage loans sold. These instruments involve elements of credit, interest rate or liquidity risk.

Commitments to extend credit are legally binding agreements to lend to customers. Commitments generally have fixed expiration dates or other termination clauses and may require payment of fees. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future liquidity requirements. Established credit standards control the credit risk exposure associated with these commitments. In some cases, BancShares requires that collateral be pledged to secure the commitment, including cash deposits, securities and other assets. At March 31, 2014, BancShares had unused commitments totaling $6.11 billion, compared to $5.84 billion at December 31, 2013.

Standby letters of credit are commitments guaranteeing performance of a customer to a third party. Those commitments are primarily issued to support public and private borrowing arrangements. To mitigate its risk, BancShares’ follows its credit policies in the issuance of standby letters of credit. At March 31, 2014 and December 31, 2013, BancShares had standby letters of credit amounting to $52.3 million and $54.8 million, respectively. The credit risk related to the issuance of these letters of credit is essentially the same as that involved in extending loans to clients and, therefore, these letters of credit are collateralized when necessary.

Pursuant to standard representations and warranties relating to residential mortgage loan sales, contingent obligations exist for various events that may occur following the loan sale. If underwriting or documentation deficiencies are discovered at any point in the life of the loan or if the loan becomes nonperforming within 120 days of its sale, the investor may require BancShares to repurchase the loan or to repay a portion of the sale proceeds. Other liabilities included reserves of $3.6 million as of March 31, 2014, unchanged from December 31, 2013, for estimated losses arising from these standard representation and warranty provisions.

BancShares has recorded a receivable from the FDIC totaling $74.8 million and $93.4 million as of March 31, 2014 and December 31, 2013 for the expected reimbursement of losses on assets covered under the various loss share agreements. These loss share agreements impose certain obligations on us that, in the event of noncompliance, could result in the delay or disallowance of some or all of our rights under those agreements. Requests for reimbursement are subject to FDIC review and may be delayed or disallowed for noncompliance. The loss share agreements are subject to interpretation by both the FDIC and FCB, and disagreements may arise regarding coverage of losses, expenses and contingencies.

The loss share agreements for four FDIC-assisted transactions include provisions related to contingent payments that may be owed to the FDIC at the termination of the agreements (clawback liability).The clawback liability represents a payment by BancShares to the FDIC if actual cumulative losses on acquired covered assets are lower than the cumulative losses originally estimated by the FDIC at the time of acquisition. The clawback liability is estimated by discounting estimated future payments and is recorded in the Consolidated Balance Sheets as a payable to the FDIC under the relevant loss share agreements. As of March 31, 2014 and December 31, 2013, the estimated clawback liability was $111.3 million and $109.4 million, respectively.

BancShares and various subsidiaries have been named as defendants in legal actions arising from their normal business activities in which damages in various amounts are claimed. BancShares is also exposed to litigation risk relating to the prior business activities of banks from which assets were acquired and liabilities assumed in the various FDIC-assisted transactions. Although the amount of any ultimate liability with respect to such matters cannot be determined, in the opinion of management, any such liability will not have a material effect on BancShares’ consolidated financial statements.