Investment Securities Available-for-sale Securities by Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Investments [Abstract]
Statutory tax rate at which other comprehensive income and weighted-average rate of investment securities are calculated	35.00%
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year	$ 1,437
Amortized cost of securities maturing in 1-5 years	31,825
Amortized cost of securities maturing in 5-10 years	76,350
Total amortized cost of securities maturing in over 10 years	665,353
Amortized Cost	777,017	$ 780,304
Fair value of securities maturing within 1 year	1,440
Fair value of securities maturing in 1-5 years	31,791
Fair value of securities maturing in 5-10 years	76,824
Total fair value of securities maturing in over 10 years	658,932
Fair Value	$ 777,940	784,701
Average yield of securities maturing within 1 year	2.23%
Average yield of securities maturing in 1-5 years	4.11%
Average yield of securities maturing in 5-10 years	3.57%
Average yield of securities maturing in over 10 years	3.29%
Total average yield	3.36%
U.S. government sponsored agencies
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year	$ 1,000
Amortized cost of securities maturing in 1-5 years	0
Amortized cost of securities maturing in 5-10 years	0
Amortized cost of securities maturing in over 10 years	0
Total amortized cost	1,000
Amortized Cost	1,000	2,908
Fair value of securities maturing within 1 year	1,000
Fair value of securities maturing in 1-5 years	0
Fair value of securities maturing in 5-10 years	0
Fair value of securities maturing in over 10 years	0
Total fair value	1,000
Fair Value	1,000	2,966
States and political subdivisions
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year	435
Amortized cost of securities maturing in 1-5 years	14,354
Amortized cost of securities maturing in 5-10 years	28,903
Amortized cost of securities maturing in over 10 years	71,965
Total amortized cost	115,657
Amortized Cost	115,657	111,283
Fair value of securities maturing within 1 year	438
Fair value of securities maturing in 1-5 years	14,484
Fair value of securities maturing in 5-10 years	29,250
Fair value of securities maturing in over 10 years	73,058
Total fair value	117,230
Fair Value	117,230	114,726
Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year	2
Amortized cost of securities maturing in 1-5 years	14,225
Amortized cost of securities maturing in 5-10 years	33,180
Amortized cost of securities maturing in over 10 years	586,395
Total amortized cost	633,802
Amortized Cost	633,802	635,504
Fair value of securities maturing within 1 year	2
Fair value of securities maturing in 1-5 years	14,020
Fair value of securities maturing in 5-10 years	33,389
Fair value of securities maturing in over 10 years	579,156
Total fair value	626,567
Fair Value	626,567	632,293
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized cost of securities maturing within 1 year	0
Amortized cost of securities maturing in 1-5 years	3,246
Amortized cost of securities maturing in 5-10 years	14,267
Amortized cost of securities maturing in over 10 years	1,824
Total amortized cost	19,337
Amortized Cost	19,337	23,770
Fair value of securities maturing within 1 year	0
Fair value of securities maturing in 1-5 years	3,287
Fair value of securities maturing in 5-10 years	14,185
Fair value of securities maturing in over 10 years	1,819
Total fair value	19,291
Fair Value	19,291	23,845
Bank-issued trust preferred securities
Schedule of Available-for-sale Securities
Amortized cost of other securities maturing in over 10 years	5,169
Amortized cost of other securities	5,169
Amortized Cost	5,169	5,146
Fair value of other securities maturing in over 10 years	4,899
Fair value of other securities	4,899
Fair Value	4,899	4,635
Equity securities
Schedule of Available-for-sale Securities
Amortized cost of other securities	2,052
Amortized Cost	2,052	1,693
Fair value of other securities	8,953
Fair Value	$ 8,953	$ 6,236

Available-for-sale Securities, Average Yield

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Statutory tax rate at which other comprehensive income and weighted-average rate of investment securities

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth through tenth rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the second through fifth rolling twelve months following the latest balance sheet. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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