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Fair Value Measurements (Schedule of Carrying Amounts and Estimated Fair Value of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Investment securities:      
Available-for-sale $ 635,641 $ 748,864 $ 576,211
Held-to-maturity 499,904 315,740 314,275
Carrying Amount [Member]      
Investment securities:      
Nonmarketable equity securities 36,142 27,369 25,572
Carrying Amount [Member] | Level 1[Member]      
Assets:      
Cash and cash equivalents 291,537 183,020 382,138
Investment securities:      
Available-for-sale 6,804 8,259 0
Carrying Amount [Member] | Level 2 [Member]      
Investment securities:      
Available-for-sale 628,837 740,605 576,211
Held-to-maturity 500,583 305,913 308,062
Loans Held-for-sale 12,319 9,128 9,347
Interest receivable 24,737 17,492 17,057
Liabilities:      
Deposits without defined maturities 5,924,103 4,741,024 4,191,894
Interest payable 1,728 755 710
Short-term borrowings 330,016 389,467 323,086
Other borrowings 206,432 0 0
Carrying Amount [Member] | Level 3 [Member]      
Investment securities:      
Held-to-maturity 500 10,500 10,500
Net loans 7,140,569 5,612,547 4,963,914
Liabilities:      
Time deposits 1,691,108 1,337,947 1,240,033
Other borrowings 41,964 0 0
Fair Value [Member]      
Investment securities:      
Nonmarketable equity securities 36,142 27,369 25,572
Fair Value [Member] | Level 1[Member]      
Assets:      
Cash and cash equivalents 291,537 183,020 382,138
Investment securities:      
Available-for-sale 6,804 8,259 0
Fair Value [Member] | Level 2 [Member]      
Investment securities:      
Available-for-sale 628,837 740,605 576,211
Held-to-maturity 499,604 308,650 307,290
Loans Held-for-sale 12,319 9,128 9,347
Interest receivable 24,737 17,492 17,057
Liabilities:      
Deposits without defined maturities 5,924,103 4,741,024 4,191,894
Interest payable 1,728 755 710
Short-term borrowings 330,016 389,467 323,086
Other borrowings 206,432 0 0
Fair Value [Member] | Level 3 [Member]      
Investment securities:      
Held-to-maturity 300 7,090 6,985
Net loans 7,151,520 5,623,454 4,967,167
Liabilities:      
Time deposits 1,692,179 1,340,015 1,242,419
Other borrowings $ 41,964 $ 0 $ 0