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Securities (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
Position
Dec. 31, 2014
USD ($)
Position
Dec. 31, 2013
USD ($)
Available-for-sale securities, fair value to amortized cost basis [Abstract]      
Amortized cost $ 1,169,337 $ 1,001,718  
Unrealized gains 9,878 14,823  
Unrealized losses 4,671 3,370  
Estimated fair value 1,174,544 1,013,171  
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 624,819 143,428  
12 months or longer 29,822 244,836  
Total 654,641 388,264  
Continuous unrealized loss position, unrealized losses [Abstract]      
Less than 12 months (4,283) (500)  
12 months or longer (388) (2,870)  
Total $ (4,671) $ (3,370)  
Continuous unrealized loss position, number of positions [Abstract]      
Less than 12 months | Position 79 59  
12 months or longer | Position 12 58  
Total | Position 91 117  
Sales transactions of securities available for sale [Abstract]      
Proceeds from sales $ 15,091 $ 189 $ 27,593
Gross realized gains 3,034 49 1,283
Net securities gains 3,034 49 1,283
Gains from calls on securities available for sale 100 100 $ 100
Amortized costs of securities available for sale pledged to secure public deposits 1,400,000 1,400,000  
Amortized costs of securities available for sale pledged as collateral for repurchase agreements 205,900    
Held-to-maturity securities, fair value to amortized cost basis [Abstract]      
Amortized cost 471,031 454,361  
Unrealized gains 3,794 2,721  
Unrealized losses 1,685 2,088  
Estimated Fair Value 473,140 454,994  
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 117,129 69,566  
12 months or longer 41,523 48,034  
Total 158,652 117,600  
Continuous unrealized loss position, unrealized losses [Abstract]      
Less than 12 months (406) (165)  
12 months or longer (1,279) (1,923)  
Total $ (1,685) $ (2,088)  
Continuous unrealized loss position, number of positions [Abstract]      
Less than 12 months | Position 16 112  
12 months or longer | Position 4 10  
Total | Position 20 122  
Securities transferred from available for sale portfolio to held to maturity portfolio   $ 340,000  
Unrealized losses of securities available for sale portfolio before transfer to held to maturity portfolio   8,300  
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]      
Within one year $ 3,462    
From one to five years 348,921    
From five to ten years 147,139    
After ten years 656,178    
Total, Amortized Cost 1,155,700    
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]      
Within one year 3,502    
From one to five years 348,512    
From five to ten years 149,185    
After ten years 656,577    
Total, Fair Value 1,157,776    
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]      
Within one year 43,624    
From one to five years 14,179    
From five to ten years 113,799    
After ten years 299,429    
Amortized cost 471,031 454,361  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]      
Within one year 43,641    
From one to five years 14,226    
From five to ten years 115,691    
After ten years 299,582    
Total, Fair Value $ 473,140 $ 454,994  
Consolidated stockholders' equity threshold percentage that no single issuer of securities exceeded except for U.S. Government securities. (in hundredths) 10.00% 10.00%  
US Treasury [Member]      
Available-for-sale securities, fair value to amortized cost basis [Abstract]      
Amortized cost   $ 23,041  
Unrealized gains   70  
Unrealized losses   0  
Estimated fair value   23,111  
Federal Agency [Member]      
Available-for-sale securities, fair value to amortized cost basis [Abstract]      
Amortized cost $ 312,580 332,193  
Unrealized gains 203 327  
Unrealized losses 1,511 2,606  
Estimated fair value 311,272 329,914  
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 186,685 66,528  
12 months or longer 19,801 198,151  
Total 206,486 264,679  
Continuous unrealized loss position, unrealized losses [Abstract]      
Less than 12 months (1,312) (226)  
12 months or longer (199) (2,380)  
Total $ (1,511) $ (2,606)  
Continuous unrealized loss position, number of positions [Abstract]      
Less than 12 months | Position 15 8  
12 months or longer | Position 2 16  
Total | Position 17 24  
State & Municipal [Member]      
Available-for-sale securities, fair value to amortized cost basis [Abstract]      
Amortized cost $ 31,208 $ 37,035  
Unrealized gains 446 587  
Unrealized losses 17 52  
Estimated fair value 31,637 37,570  
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 4,599 8,818  
12 months or longer 502 1,321  
Total 5,101 10,139  
Continuous unrealized loss position, unrealized losses [Abstract]      
Less than 12 months (14) (42)  
12 months or longer (3) (10)  
Total $ (17) $ (52)  
Continuous unrealized loss position, number of positions [Abstract]      
Less than 12 months | Position 7 33  
12 months or longer | Position 1 5  
Total | Position 8 38  
Mortgage-Backed [Member]      
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months $ 177,270 $ 10,400  
12 months or longer 1,066 35,565  
Total 178,336 45,965  
Continuous unrealized loss position, unrealized losses [Abstract]      
Less than 12 months (1,068) (36)  
12 months or longer (14) (254)  
Total $ (1,082) $ (290)  
Continuous unrealized loss position, number of positions [Abstract]      
Less than 12 months | Position 33 10  
12 months or longer | Position 5 31  
Total | Position 38 41  
Mortgage-backed Securities, Government Sponsored Enterprises [Member]      
Available-for-sale securities, fair value to amortized cost basis [Abstract]      
Amortized cost $ 398,086 $ 339,190  
Unrealized gains 4,141 7,597  
Unrealized losses 1,068 224  
Estimated fair value 401,159 346,563  
Mortgage-backed Securities, U.S. Government Agency Securities [Member]      
Available-for-sale securities, fair value to amortized cost basis [Abstract]      
Amortized cost 8,191 17,367  
Unrealized gains 560 863  
Unrealized losses 14 66  
Estimated fair value 8,737 18,164  
Collateralized Mortgage Obligations [Member]      
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 256,265 57,682  
12 months or longer 5,218 6,598  
Total 261,483 64,280  
Continuous unrealized loss position, unrealized losses [Abstract]      
Less than 12 months (1,889) (196)  
12 months or longer (54) (74)  
Total $ (1,943) $ (270)  
Continuous unrealized loss position, number of positions [Abstract]      
Less than 12 months | Position 24 8  
12 months or longer | Position 2 4  
Total | Position 26 12  
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]      
Available-for-sale securities, fair value to amortized cost basis [Abstract]      
Amortized cost $ 364,936 $ 199,837  
Unrealized gains 931 1,828  
Unrealized losses 1,828 234  
Estimated fair value 364,039 201,431  
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]      
Available-for-sale securities, fair value to amortized cost basis [Abstract]      
Amortized cost 40,699 40,237  
Unrealized gains 348 497  
Unrealized losses 115 36  
Estimated fair value 40,932 40,698  
Other Securities [Member]      
Available-for-sale securities, fair value to amortized cost basis [Abstract]      
Amortized cost 13,637 12,818  
Unrealized gains 3,249 3,054  
Unrealized losses 118 152  
Estimated fair value 16,768 15,720  
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 0 0  
12 months or longer 3,235 3,201  
Total 3,235 3,201  
Continuous unrealized loss position, unrealized losses [Abstract]      
Less than 12 months 0 0  
12 months or longer (118) (152)  
Total $ (118) $ (152)  
Continuous unrealized loss position, number of positions [Abstract]      
Less than 12 months | Position 0 0  
12 months or longer | Position 2 2  
Total | Position 2 2  
Mortgage-Backed [Member]      
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months $ 9,325    
12 months or longer 0    
Total 9,325    
Continuous unrealized loss position, unrealized losses [Abstract]      
Less than 12 months (107)    
12 months or longer 0    
Total $ (107)    
Continuous unrealized loss position, number of positions [Abstract]      
Less than 12 months | Position 1    
12 months or longer | Position 0    
Total | Position 1    
Collateralized Mortgage Obligations [Member]      
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months $ 105,604 $ 26,052  
12 months or longer 41,523 46,415  
Total 147,127 72,467  
Continuous unrealized loss position, unrealized losses [Abstract]      
Less than 12 months (281) (49)  
12 months or longer (1,279) (1,916)  
Total $ (1,560) $ (1,965)  
Continuous unrealized loss position, number of positions [Abstract]      
Less than 12 months | Position 12 2  
12 months or longer | Position 4 4  
Total | Position 16 6  
State & Municipal [Member]      
Held-to-maturity securities, fair value to amortized cost basis [Abstract]      
Amortized cost $ 188,438 $ 135,978  
Unrealized gains 2,288 674  
Unrealized losses 18 123  
Estimated Fair Value 190,708 136,529  
Continuous unrealized loss position, fair value [Abstract]      
Less than 12 months 2,200 43,514  
12 months or longer 0 1,619  
Total 2,200 45,133  
Continuous unrealized loss position, unrealized losses [Abstract]      
Less than 12 months (18) (116)  
12 months or longer 0 (7)  
Total $ (18) $ (123)  
Continuous unrealized loss position, number of positions [Abstract]      
Less than 12 months | Position 3 110  
12 months or longer | Position 0 6  
Total | Position 3 116  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]      
Amortized cost $ 188,438 $ 135,978  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]      
Total, Fair Value $ 190,708 $ 136,529