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Business Combinations - Fair value of loans acquired and pro forma information (Details) (USD $)
12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Foster Bankshares Inc
Aug. 12, 2013
Foster Bankshares Inc
Dec. 31, 2013
Foster Bankshares Inc
Merger and integration expense
Dec. 31, 2013
Pacific International Bancorp, Inc.
Feb. 13, 2013
Pacific International Bancorp, Inc.
Dec. 31, 2013
Pacific International Bancorp, Inc.
Merger and integration expense
Dec. 31, 2013
Foster Bankshares, Inc and Pacific International Bancorp, Inc.
Dec. 31, 2012
Foster Bankshares, Inc and Pacific International Bancorp, Inc.
Business Acquisition [Line Items]                      
Outstanding principal balances on loans acquired       $ 279,700,000     $ 126,000,000        
Carrying amount related to outstanding principal balances acquired       235,100,000     107,600,000        
Acquisition-related expenses 5,161,000 3,809,000 4,713,000     4,000,000     1,100,000    
Fair value of loans acquired:                      
Contractually required principal and interest at acquisition         150,430,000     54,462,000      
Contractual cash flows not expected to be collected (nonaccretable discount)         37,447,000     9,687,000      
Expected cash flows at acquisition         112,983,000     44,775,000      
Interest component of expected cash flows (accretable discount)         14,928,000     4,945,000      
Fair value of acquired impaired loans         98,055,000     39,830,000      
Pro forma: from the beginning of the period                      
Net Interest Income                   264,040,000 264,669,000
Net income, pro forma                   $ 84,304,000 $ 74,949,000
Earnings per share - basic, pro forma                   $ 1.07 $ 0.88
Earnings per share - diluted, pro forma                   $ 1.06 $ 0.88